[Q] Looking for an Android based modding/developing-friendly phone - General Questions and Answers

Hi all.
I am a programmer and I would like to do some Android application developing some day.
Now I have a Nokia N79, got it pretty cheap from my operator. Operator has changed his terms and now there is no way to get a cheap phone, so it seems I'll have to buy Android for a full price .
I was disappointed to find out that almost all mid-range Android phones have worse cameras than my N79. I really would like to buy something with not very large display (4" is overkill for me and I have small hands). But I just cannot find a phone which is good and small.
The other thing that bothers me is about developing and modding.
I have read on Sony Ericsson blog that SE officially supports unlocking their phones to have full access (warranty void) but there is a warning that the process is irreversible.
Now I a am a bit confused - why I cannot just use their update software and revert the phone as it was? After all, the other phones can be reverted to the original state even after rooting and s-offing and other tricks, can't they?
Also it is confusing how this rooting and updating stuff works on all the phones. If I have no root, does that mean that I cannot load a custom ROM? But how the phone vendor updates their new ROMs? Do they all the update together with the bootloader? But if they reflash also the bootloader, then why SE warns that there is no way back after unlocking?
Really confusing. Maybe there is some article or wiki about how each vendor protects their phone - wich needs hacking bootloader to get root access, which needs root access to load custom ROM, which vendor reflashes also the bootloader with their official updates and so on.
I have read that now with Android version 2.2 there is a way to install programs on flash cards even without rooting (Andorid SDK is used to modify setInstallLocation setting). Maybe there is a phone which can be rooted and reflashed without hacking its bootloader? Or maybe there are even phones which can load custom ROMs without rooting? I really do not like idea about messing with bootloader. If things go wrong with ROM, I can just upload the old one, I guess. But if bootloader goes bad, there is a good chance to get a brick.
So the main question is: which Android phone manufacturer has the most developer/modder-friendly policy and makes modding more safe?

Uhh, never mind, I was a bit confused with formulating the question, so I got everything messed up in one long mess. Actually this thread can be deleted...

Related

Locked Bootloader Motorola Atrix

Sorry I am a noob at android and i am trying to decide between which at&t phone i should choose. So does this locked bootloader thing set me back from customization for android phones?
Any other suggestions for at&t android phones i'm due for an upgrade june 2nd.
Bump?
Going crazy trying to figure out what android phone i want from at&t.
thanks in advance.
Yes, for now anyway. It means you cant install complete roms like CM7 or MIUI. The ones available are mostly themes. That said, there are multiple workarounds being worked on at the moment with good progress being made on them, so it probably wont be an issue before too long.
Personally, I'd go for the Atrix. Its still the best phone on AT&T from a raw horsepower perspective.
so eventually i will be able to unlock those custom roms, with that said if i get the device and root it what will be the extra features?

[Completed] Finally got my SM-T217a running 4.4.2 rooted

But because for so long the bootloader seemed unlockable, and because when they finally did get it unlocked, it was with a device that was almost 200$, there was a complete lack of development on this particular device once it was given the 4.4.2 upgrade. Over the course of a year, I have found many things about the tablet that I have been unable to find out on my own to get into.
I found that the tab 3 lte was actually designed as a really big phone, but the dialer, phone and dialer storage were blocked by AT&T, so even with a sim chip, the tablet just will not function as a phone without getting a VOIP app, and I really shouldnt have to considering that I have a perfectly good phablet capable of actual phone calls. I dont know how to use terminal emulator very well, or if the language changes drastically between versions of Android.
I was also wondering if it was actually possible to unlock the bootloader from Terminal emulator now that I have full root.
Is there a way of finding out if my current stock rom is one of those that have the SO- attached to the system folders so that I cant write anything to the system folders without reverting to out of the box system restore. And lastly, I was wondering if there was ever any custom recovery that was made for this device that would be usable now, considering that when the device came out it was on Jellybean, not kitkat. If anyone could help me I would be greatly appreciative. I know it sounds like a lot of work for a tablet , but I am not exactly overflowing with money to go and buy a new one. This was a gift and I just want to try to avoid bricking it when I just now finally got the damned things rooted.
TrustInSin said:
But because for so long the bootloader seemed unlockable, and because when they finally did get it unlocked, it was with a device that was almost 200$, there was a complete lack of development on this particular device once it was given the 4.4.2 upgrade. Over the course of a year, I have found many things about the tablet that I have been unable to find out on my own to get into.
I found that the tab 3 lte was actually designed as a really big phone, but the dialer, phone and dialer storage were blocked by AT&T, so even with a sim chip, the tablet just will not function as a phone without getting a VOIP app, and I really shouldnt have to considering that I have a perfectly good phablet capable of actual phone calls. I dont know how to use terminal emulator very well, or if the language changes drastically between versions of Android.
I was also wondering if it was actually possible to unlock the bootloader from Terminal emulator now that I have full root.
Is there a way of finding out if my current stock rom is one of those that have the SO- attached to the system folders so that I cant write anything to the system folders without reverting to out of the box system restore. And lastly, I was wondering if there was ever any custom recovery that was made for this device that would be usable now, considering that when the device came out it was on Jellybean, not kitkat. If anyone could help me I would be greatly appreciative. I know it sounds like a lot of work for a tablet , but I am not exactly overflowing with money to go and buy a new one. This was a gift and I just want to try to avoid bricking it when I just now finally got the damned things rooted.
Click to expand...
Click to collapse
Hi, thanks for using XDA Assist!
Please post here for further assistance:
http://forum.xda-developers.com/galaxy-tab-3/help
Your device experts are located there.
Good luck!
Thread closed.

Is the CAT S60 (Snapdragon 617) Rootable?

Morning all,
I have recently received my CAT S60 and I have to say, I am extremely pleased with the device out of the box. It is solid, extremely well built, battery life is amazing and camera quality is far better than the reviews led me to believe. Call quality is also the best I have ever had on any handset.
Unfortunately, I have never before owned a device without root. I have rooted most of my phones + installed a custom rom within a couple of days of opening the box. Sadly, this time round I've bought a less-popular device which is quite new and there is no existing support.
I am able to do most of the root-requiring functions with this phone (flashlight via button from locked, skip tracks with volume etc) using software workarounds, but I am already butting up against things that are pissing me off because I don't have system access, and I am so used to having it.
I've read horror stories about the lockdown function Qualcomm have applied to the 617 chips, but I now see that some phones with this chip have already been rooted (Motorola) so I am wondering, what are the chances that I will see root or a root exploit for this phone in the near future?
I'm not sure that I would sell the device over not being able to gain root, but it is really really annoying me.
I would be interested too. I couldnt even figure out how to set the s60 to downloadmode (If there is such a mode at all) to flash a custom recovery like twrp. Recoverymode is the usual volume up before poweron.
heinzherbert said:
I would be interested too. I couldnt even figure out how to set the s60 to downloadmode (If there is such a mode at all) to flash a custom recovery like twrp. Recoverymode is the usual volume up before poweron.
Click to expand...
Click to collapse
Recovery mode is volume up and power button together for 3 to 4 seconds
There is a switch in developer options to allow bootloader to be unlocked. Maybe this, combined with factory recovery menu will set us free? Flash a modified factory rom with root enabled? The stock ROM is very clean.
bandario said:
There is a switch in developer options to allow bootloader to be unlocked. Maybe this, combined with factory recovery menu will set us free? Flash a modified factory rom with root enabled? The stock ROM is very clean.
Click to expand...
Click to collapse
There is an option to unlock bootloader. It's called OEM unlocking
So, flicking this switch should unlock the bootloader???
That gives me a bit of hope for some development on this handset. None of the previous cat phones have seen any real development.
bandario said:
So, flicking this switch should unlock the bootloader???
That gives me a bit of hope for some development on this handset. None of the previous cat phones have seen any real development.
Click to expand...
Click to collapse
To be honest flicking that switch does nothing for me. I am unsure how to unlock the bootloader
On S60 bootloader is locked.
No fastboot, but you will be able to select recovery mode.
bump. I'd like to see this phone rooted.
Any progress on this or has anyone tried yet?
My SONY Z1C died on me the other day and I'd need to know if there's at least a chance to root this one.
I'm considering getting the S60 but only if I'm able to root it. An unrooted phone is barely usable to me...
Greetz and thanks in advance,
Unr3aL67
haven't tried rooting mine yet. Not felt the need to yet TBH
Mine is working pretty good without root. Only reason I'd want root honestly is to make backups, and perhaps uninstall a couple apps, but the bloatware is minimal.
Sent from my S60 using Tapatalk
Since the original question was "Is this rootable?" and lately answers have come in the form of "I haven't tried rooting mine" .... which doesn't seem much like an answer at all, to be honest .... I want to join the OP in asking this question. For those of us who have grown accustomed to the freedom and flexibility of having root access to our devices, it would be really nice to know (before making a decision to purchase) whether it is possible to obtain root on the CAT S60.
Does anyone know where to get a zip of the ROM?
After the Arstechnica review this may be my next phone. However, I really require a way to root it so that I can use iptables.
Anyone had any luck?
In response to your query we regret to inform you that we do not offer any assistance or tools to root our devices.
Click to expand...
Click to collapse
I tried contacting support about help to root, got the above back. It's a work phone so maybe it's better that I don't mess with it.
If anyone is going to root or make a custom recovery, it'll need to be without any support from the manufacturer. I mostly miss Xposed Framework for adblocking, less frequent notifications and the ability to longpress the back key to enable/disable screen rotation, the ROM itself is 99% "stock" otherwise and I have no complaints on that front.
In response to your query we regret to inform you that we do not offer any assistance or tools to root our devices.
Click to expand...
Click to collapse
This is, of course, their right, and buyer beware if you wanted a rootable phone. Still, I can't keep from being annoyed at this attitude; if I'm paying them good money for my devices, I want the freedom to do with it everything that I want, including modifying it and knowingly voiding my warranty, or even breaking it outright, if that's what makes me happy. Especially now that rooting/jailbreaking is a thing. Wanting to keep on controlling and limiting how people are able to use your product after you've sold it to them always sticks in my craw.
I guess I'll be passing on what otherwise looks like a perfect phone for me, unless some shining hero (or heroine) manages to figure out how to root a CAT S60 anyway, despite what the manufacturer might wish.
Tangib1e said:
This is, of course, their right, and buyer beware if you wanted a rootable phone. Still, I can't keep from being annoyed at this attitude; if I'm paying them good money for my devices, I want the freedom to do with it everything that I want, including modifying it and knowingly voiding my warranty, or even breaking it outright, if that's what makes me happy. Especially now that rooting/jailbreaking is a thing. Wanting to keep on controlling and limiting how people are able to use your product after you've sold it to them always sticks in my craw.
I guess I'll be passing on what otherwise looks like a perfect phone for me, unless some shining hero (or heroine) manages to figure out how to root a CAT S60 anyway, despite what the manufacturer might wish.
Click to expand...
Click to collapse
It is indeed a great phone, but the camera is sub-par. The focus takes an age compared to my Z5 Compact. I would wait for the second-generation version unless you critically need FLIR as a feature.
I've done a bit of poking around. I suspect that the bootloader could be unlocked with the commands "adb reboot bootloader" followed by "fastboot oem unlock-go".
I'm not going to do that at this point because without a custom ROM to flash there is no point in me voiding my warranty, but I believe it should be possible with USB debugging enabled, and the bootloader confirmed as unlockable.
I think this is how root will arrive on this device: by way of modifying a flashable ROM and flashing it to the device using QFIL as you would any other Qualcomm device.
The tools are all there in front of us, we just need someone with the knowledge to create that modified rom file....at this point I can't even find a factory rom to flash.
Given the recent speed and quality enhancements made available through the stock camera app, I also suspect that doing this will send us backwards to a much ****tier camera as has been the case with many sony handsets in the past.
bandario said:
There is a switch in developer options to allow bootloader to be unlocked. Maybe this, combined with factory recovery menu will set us free? Flash a modified factory rom with root enabled? The stock ROM is very clean.
Click to expand...
Click to collapse
Chuggers said:
There is an option to unlock bootloader. It's called OEM unlocking
Click to expand...
Click to collapse
bandario said:
So, flicking this switch should unlock the bootloader???
That gives me a bit of hope for some development on this handset. None of the previous cat phones have seen any real development.
Click to expand...
Click to collapse
That switch is available in a lot of devices and does nothing on a lot of them
Sent from my Lenovo A7010a48 using XDA Labs

YA 4.4.2 Bootloader Discussion

Hey there remaining Verizon S3 users!
Coming from my favorite device the T959V this has been quite a trip. This device's bootloader is seemingly impossible to unlock on the 4.4.2 NE1 firmware.
I've got a slightly modified Superlite rom rolling with SafeStrap already strapped. And it is great to say the least. Added some initd and utilities. Evie launcher is pretty nice btw- recommend a try :good:
However. I still really want this thing to be unlocked. The T959V has multiple working Fro, GB, ICS, JB, KK, L, M, AND Nougat ROMS. Totally different devices yes but-- even the newer S4-S6 have cracked loaders now.
There has to be a special way to change this things firmware.
Right now I have 2 ideas to throw out to the wind-
1- Would be that there could be a way to trick the device into thinking it is receiving a new update. Maybe somehow with CSC or something. Also I saw a file named authorized.xml and was reading through to find traces of knox. Would unauthorizing knox strings somehow render it useless?
2- I was reading a suggested post about AVB boots and how they can be resigned on devices such as the Google Pixel and allows the newer patches to still install. Including what was described as a forced re-sign method.
--- Could we somehow resign the bootloader on our device so as to gain control of it? Has anybody tried anything like this since around 2015?
I'll gladly talk about all of this more whenever I feel like popping on- and atm I have no web besides this service. :silly: so no DOS updates and no shiny linux for now.
Gladly tell me that it is "impossible" but I'm not asking that. I'm trying to add some ideas to possibly do the impossible.
Edit: This seems to be an interesting lead on emmc cracking this device. It's probably why people in other threads were in search of a "dev" edition.
http://forum.gsmhosting.com/vbb/f777/unlock-samsung-devices-bootloader-emmc-backdoor-2142981/
graycow9 said:
Hey there remaining Verizon S3 users!
Coming from my favorite device the T959V this has been quite a trip. This device's bootloader is seemingly impossible to unlock on the 4.4.2 NE1 firmware.
I've got a slightly modified Superlite rom rolling with SafeStrap already strapped. And it is great to say the least. Added some initd and utilities. Evie launcher is pretty nice btw- recommend a try :good:
However. I still really want this thing to be unlocked. The T959V has multiple working Fro, GB, ICS, JB, KK, L, M, AND Nougat ROMS. Totally different devices yes but-- even the newer S4-S6 have cracked loaders now.
There has to be a special way to change this things firmware.
Right now I have 2 ideas to throw out to the wind-
1- Would be that there could be a way to trick the device into thinking it is receiving a new update. Maybe somehow with CSC or something. Also I saw a file named authorized.xml and was reading through to find traces of knox. Would unauthorizing knox strings somehow render it useless?
2- I was reading a suggested post about AVB boots and how they can be resigned on devices such as the Google Pixel and allows the newer patches to still install. Including what was described as a forced re-sign method.
--- Could we somehow resign the bootloader on our device so as to gain control of it? Has anybody tried anything like this since around 2015?
I'll gladly talk about all of this more whenever I feel like popping on- and atm I have no web besides this service. :silly: so no DOS updates and no shiny linux for now.
Gladly tell me that it is "impossible" but I'm not asking that. I'm trying to add some ideas to possibly do the impossible.
Edit: This seems to be an interesting lead on emmc cracking this device. It's probably why people in other threads were in search of a "dev" edition.
http://forum.gsmhosting.com/vbb/f777/unlock-samsung-devices-bootloader-emmc-backdoor-2142981/
Click to expand...
Click to collapse
I've been around this and many many other forums for years now. If there was an unlock method it would of been found years ago. Devs have long moved on from the old S3. I still have my S3 lying around, bootloader unlocked but I really haven't messed around with it for quite a long time now
And yes the dev edition would of been nice had someone actually had one, it would of of course made it easier to crack the bootloader option maybe. I don't know much about the ins and outs of the device but I know many are permanently locked and will probably never be unlocked.
As far as certain other Samsung devices being unlocked those are far and few between. VZW got smart and started just locking them from the start. This is a huge reason why I left Verizon. The S3 was my last device on big red. I since have had a Nexus 5 and 6 and now a oneplus 3t. I really don't like locked devices and the ability to unlock them and customize them just intrigues me to no end. Good luck however in finding something that may work, but I highly doubt it will ever be cracked
Sent from my OnePlus 3T
Ya I expected your negatude Shapes. Already seen that you have been searching but it isn't just some application you run. It's an unknown exploit that I'm sure exists. There are exploits right now that can be considered viral potentially exploiting my device as we speak. Maybe not granted my semi-precautious take on things.
Quadrooter and dirty cow could be used to exploit the S3 and gain access to a quoted "all" physical memory. So I find it hard to believe that things can't work in our favor.
Being open minded here. After all, this is technically hacking your own device. Which--
Got me thinking the other day, becausr I was setting up my laptop proper- could we run a nix distro and poke through the bootloader's parameters via exploitation tools? Referencing Kali or it's elder BTrack. But I think it is possible and I just haven't gotten around this loop mounting issue.
To be clear, running a distro ON the device. My flat is already running square.
Sent from my SCH-I535 using XDA-Developers Legacy app
Also a purposely separate post- I'm building a ROM for this locked firmware and the goal is to have some specific updated apps and yet trim it nicely so as to save space and RAM it's mostly stock style-wise but it'd be cool to re-theme it. I haven't gotten things deodexed yet- being I haven't gotten my apktools working proper yet.
Is there anybody left to be interested in this? I haven't posted anything I've made before- usually just keep them lying around for emergency flashes.
Sent from my SCH-I535 using XDA-Developers Legacy app
graycow9 said:
Ya I expected your negatude Shapes. Already seen that you have been searching but it isn't just some application you run. It's an unknown exploit that I'm sure exists. There are exploits right now that can be considered viral potentially exploiting my device as we speak. Maybe not granted my semi-precautious take on things.
Quadrooter and dirty cow could be used to exploit the S3 and gain access to a quoted "all" physical memory. So I find it hard to believe that things can't work in our favor.
Being open minded here. After all, this is technically hacking your own device. Which--
Got me thinking the other day, becausr I was setting up my laptop proper- could we run a nix distro and poke through the bootloader's parameters via exploitation tools? Referencing Kali or it's elder BTrack. But I think it is possible and I just haven't gotten around this loop mounting issue.
To be clear, running a distro ON the device. My flat is already running square.
Click to expand...
Click to collapse
I don't think shapes was trying to act negative at all, just stating the obvious. Nobody is going to try to unlock the Verizon S3, it's pretty much a dead end.
The unlock method used on the S5 will most likely work on this phone, but we need a developer CID to rewrite to the emmc as the series chip used on the S3 likely has the same vulnerability. This is what happened on the S5.
If you read some of the other posts (sounds like you have), we looked for an S3 developer edition but had no luck in tracking one down. For one, it's an incredibly old device. Secondly, you'd have to be semi retarded to purchase one as the original unlock method was around before the developer edition was released.
So yes, if you can find a developer S3 this will likely be an unlock method. It tricks the S3 into thinking it's a developer phone and unlocks the bootloader if the method to write it works the same as in the S5.
As for your questions,
1. I think you're underestimating the amount of security that goes into the bootloader itself. If you want to learn a lot about Android security in general, in the Android security discussion section located under general forums, there's tons of info regarding how complex this all is. But basically, in order to send an update patch, it needs to be signed (you can't just fake the signature) and it must agree with the current bootloader. The way the bootloader is written, it simply won't allow a reversion back to earlier versions or it'll abort the boot.
An easier way to think of this is understanding that the changes made are preinstalled before the actual boot. There's no way for us to change this through normal methods as the emmc has to be written to directly. There is no way to do this from download or recovery mode. Wouldn't matter if you flashed it or used and update package, they are essentially the same thing.
So the only way to actually change the bootloader is to write to the emmc directly through use of the JTAG port. This changes the code of the entire bootloader before the boot and the phone will boot up with any version of the S3 bootloader you write.
2. I think I kind of answered that?
Hope it's clear.
BadUsername said:
I don't think shapes was trying to act negative at all, just stating the obvious. Nobody is going to try to unlock the Verizon S3, it's pretty much a dead end.
The unlock method used on the S5 will most likely work on this phone, but we need a developer CID to rewrite to the emmc as the series chip used on the S3 likely has the same vulnerability. This is what happened on the S5.
If you read some of the other posts (sounds like you have), we looked for an S3 developer edition but had no luck in tracking one down. For one, it's an incredibly old device. Secondly, you'd have to be semi retarded to purchase one as the original unlock method was around before the developer edition was released.
So yes, if you can find a developer S3 this will likely be an unlock method. It tricks the S3 into thinking it's a developer phone and unlocks the bootloader if the method to write it works the same as in the S5.
As for your questions,
1. I think you're underestimating the amount of security that goes into the bootloader itself. If you want to learn a lot about Android security in general, in the Android security discussion section located under general forums, there's tons of info regarding how complex this all is. But basically, in order to send an update patch, it needs to be signed (you can't just fake the signature) and it must agree with the current bootloader. The way the bootloader is written, it simply won't allow a reversion back to earlier versions or it'll abort the boot.
An easier way to think of this is understanding that the changes made are preinstalled before the actual boot. There's no way for us to change this through normal methods as the emmc has to be written to directly. There is no way to do this from download or recovery mode. Wouldn't matter if you flashed it or used and update package, they are essentially the same thing.
So the only way to actually change the bootloader is to write to the emmc directly through use of the JTAG port. This changes the code of the entire bootloader before the boot and the phone will boot up with any version of the S3 bootloader you write.
2. I think I kind of answered that?
Hope it's clear.
Click to expand...
Click to collapse
Truthfully after being around the forums for as long as I have I'm really surprised there is any interest in unlocking this device at this point in time. There are just so many other options and unlocked vzw s3s are not that hard to come by.
And I wasn't being negative it's about being realistic. Thanks for sticking up for me brother
Sent from my OnePlus 3T
Are there any updates to this by any chance, I am interested :C
any hope?

Are there any phones actually worth rooting anymore?

Due to a little frustration I decided to create a whole thread for this.
I suck at computers and I have no idea what I am doing so I ended up bricking my device lmao.
In theory, the thought of rooting your device, and installing a custom OS sounds great! (Like communism) but when put in practice never really works out. The reason for that (I think) is because there are so many different versions, models, and brands. I end up spending all my time trying to refine my search to the right software and versions, and then when I do, I am stuck with some stupid site like (every damn rom site) with a 20kb/s download rate, and a page full of ads! Why? Because they are storing like 2 billion different 2GB roms. In my opinion paying for faster download speed from these websites is ridiculous. I don't even know why they offer (you would have to be stupid(like me)).
(tl;dr: Android SUCKS)
So, now to my actual question...
With the release of the Librem 5 phone, there really is not going to be a point to rooting phones anymore, because google with already be decimated from it... But that comes out in April/May and I still need a phone in the meantime.
So.. Are there any cheap phones ($500+/-), that are not a pain in the ass to root? And one that the developers actually care about to actively develop. All I wan't is a phone I can install stock android with root, and that can be installed without google or gapps. Also I live in Canada, which is another reason why it's a pain in the ass to find a decent phone because all our carriers deadbolt their firmware, and bootloaders like their storing the coordinates to some secret location with a pot of gold.
starscrpt said:
Due to a little frustration I decided to create a whole thread for this.
I suck at computers and I have no idea what I am doing so I ended up bricking my device lmao.
In theory, the thought of rooting your device, and installing a custom OS sounds great! (Like communism) but when put in practice never really works out. The reason for that (I think) is because there are so many different versions, models, and brands. I end up spending all my time trying to refine my search to the right software and versions, and then when I do, I am stuck with some stupid site like (every damn rom site) with a 20kb/s download rate, and a page full of ads! Why? Because they are storing like 2 billion different 2GB roms. In my opinion paying for faster download speed from these websites is ridiculous. I don't even know why they offer (you would have to be stupid(like me)).
(tl;dr: Android SUCKS)
So, now to my actual question...
With the release of the Librem 5 phone, there really is not going to be a point to rooting phones anymore, because google with already be decimated from it... But that comes out in April/May and I still need a phone in the meantime.
So.. Are there any cheap phones ($500+/-), that are not a pain in the ass to root? And one that the developers actually care about to actively develop. All I wan't is a phone I can install stock android with root, and that can be installed without google or gapps. Also I live in Canada, which is another reason why it's a pain in the ass to find a decent phone because all our carriers deadbolt their firmware, and bootloaders like their storing the coordinates to some secret location with a pot of gold.
Click to expand...
Click to collapse
Get something that is not a Samsung, not carrier branded(an international model) and is factory unlocked or can be unlocked.
I suggest you just do some searching to find some devices that you are interested in, then write down the model number of each device and then do some Google searches using those model numbers one at a time to see if a known rooting method exists for each model, then do some Google searching to see if TWRP exists for each model number, then do some searches to see if there are ROMs available for each model number.
We can't predict the future and say which devices will have a rooting method, we can only point you to devices that have already had a known rooting method discovered for that model, you can find that information yourself by doing the Google searches listed below.
To find root methods for the devices:
"Root for (specific device model number here)"
That should find root method for the device in question.
To find TWRP or custom recovery for the devices:
"TWRP for (specific device model number here)"
Or
"Custom recovery for (specific device model number here)"
That should find TWRP or custom recovery if it exists for the device in question.
To find custom ROMs for the devices:
"Custom ROMs for (specific device model number here)"
That should find ROMs if they exist for the device in question.
You might want to consider getting an international device directly from the manufacturer that is factory unlocked or can be unlocked(also known as SIM/carrier unlocked) instead of getting a carrier branded/sold device. Factory direct doesn't come with bloatware and unlocked/unlockable means it should be able to be activated on your carrier network.
Also, make sure the device has a factory unlocked bootloader(this is not the same thing as SIM/carrier unlocked) or can at least be unlocked using a known and verified unlock method. The unlocked bootloader is required if you want to flash custom recovery or custom ROMs.
If you just want to use the stock firmware and modify it to remove the Google stuff, unlocked bootloader won't be required for that. But, if you are going to just modify the stock software already on the device, I will advise you to make sure that the stock firmware for that device is available for download and then download a copy of it just in case you mess something up in the process of removing Google and its components, then you can just flash the firmware on the device to fix it(if you don't screw it up too bad, that is).
I would really recommend that you choose a device that has:
1) an unlocked/unlockable bootloader so that you can flash TWRP on the device
2) has an available downloadable stock firmware so that you can repair the device, if needed
3) has a TWRP recovery available so it can be installed on the device and then used to create a backup of your unmodified stock ROM, then you can modify the device and if you screw something up, you can use TWRP to restore the backup that you create, this will return the device to working condition.
Sent from my LGL84VL using Tapatalk
Droidriven pretty much covered it extremely well.
With regards to rooting:
It often can raise the stress levels beyond normal. Set aside time and take each step slowly and deliberately. Some guides can be much worse than others.
PS. Your idea of a cheap phone is at least 3x the cost of my idea of a cheap phone
The Asus Zenfone 6 just released bootloader unlock and kernel source so there should be a fairly healthy dev community when its released in the US.
The librem 5 ?? I dunno , on my list for sure . but hardware specs soundsmeh for the price . And will we be able to install ubuntu software like clementine music play ? jeez if so that would make up for the lack hardware.
looks like 2019 q3 is going to be an exciting time. I want the zenfone 6 but I dunno..... that librem 5 ubuntu phone is going to need to be checked out once rc is released .

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