Question about bootloader, radio version before flashing. - ONE Q&A, Help & Troubleshooting

As a nexus user, I'm not entirely sure if this is relevant, however, I wanted to know does the version of bootloader, radio, and etc. make a difference if I wanted to flash a rom, such as LineageOS on my wife's phone? Do roms flash these? or do I need to flash a factory image before hand?

memphian said:
As a nexus user, I'm not entirely sure if this is relevant, however, I wanted to know does the version of bootloader, radio, and etc. make a difference if I wanted to flash a rom, such as LineageOS on my wife's phone? Do roms flash these? or do I need to flash a factory image before hand?
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Click to collapse
If you're on cos13.1.x,you can flash any nougat ROM directly.

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Flashing Firmware / Bootloader / Modem

Hi,
I´m a neewbie to Samsung. My phone is a S6 SM-G920F, Baseband G920FXXU1AOCW
I came form an HTC and I´ve seen that flashing things are very different. So here are my questions:
1. I think, my bootloader is unlocked but I didin´t know for sure. So how can I check this?
(My HTV showed me this by using fastboot, didn´t know if there is fastboot with Samsung and how to start it - only know the download-mode and how to enter TWRP recovery)
2. Flashing firmware via Odin (i. e. from sammobile.com) means to loose my root again, right?
3. If I loose root, where do I get custom Firmwares and how do I flash them (if this is possible)?
4. If not, is it enough to flash bootloader and modem through Odin?
All answers are appreciated. Thanks in advanced.
Maybe someone can link me to an step to step instruction...
Fastboot is android doesn't matter who makes the phone.
If you flash a rom from sammobile then you will go to whichever stock you pick.
Other ROMs are available here. The phone is new. There aren't many yet. Cyanogen mod isn't available yet.
Root is available by flashing cfautoroot with Odin. You will need to get the specific one.
You can replace the recovery by flashing twrp team win recovery project with Odin.
You can flash boot loader and modem. Make sure you get the right region. The modem frequencies are different in different places.
You may find flashing a whole ROM even stock will fail. This is because the partitions are not the same size for all s6 stock ROMs. Don't ask me why. You can open the tar find which file stopped the flash delete it from the tar and flash again.
quatzar said:
Fastboot is android doesn't matter who makes the phone.
If you flash a rom from sammobile then you will go to whichever stock you pick.
Other ROMs are available here. The phone is new. There aren't many yet. Cyanogen mod isn't available yet.
Root is available by flashing cfautoroot with Odin. You will need to get the specific one.
You can replace the recovery by flashing twrp team win recovery project with Odin.
You can flash boot loader and modem. Make sure you get the right region. The modem frequencies are different in different places.
You may find flashing a whole ROM even stock will fail. This is because the partitions are not the same size for all s6 stock ROMs. Don't ask me why. You can open the tar find which file stopped the flash delete it from the tar and flash again.
Click to expand...
Click to collapse
Thanks for answering. My questions had an other intention, I think.
My S6 is already rooted and I have a custom recovery (TWRP) :good:
I would like to know if you have to flash a whole firmware or only bootloader/modem? Because I didn´t seen a post here for a full firmware yet.
I am not familiar with the differences between htc whole firmware and samsung bootloader/modem
Actually I am on Firmware G920FXXU1AOCW. But there are newer ones like XXU1AOE3 or XXU1AOE4.
In the days of my htc you couldn´t flash only bootloader or modem, you had to flash a whole firmware (like radio, drivers, bootloader, modem etc.)
Flashing only modem and bootloader will it update i. e. touchscreen drivers? If not, where do I get this ones? You know, because of root I don´t get OTA´s anymore...
The modem just controls how your phone hardware connects to carrier towers etc.
The boot loader is a tiny thing that tells the processor where and how to load the OS.
The software for pretty much everything is in /system.
Many of these releases are the same software, region specific. The dates are fairly unimportant for the same version number. They generally reference the time when they were uploaded by someone. Not that they have updates and fixes.
Just wanted to know can I change my phone logo MetroPCS to say T-mobile with all the T-mobile add on. I have a Samsung Galaxy s6 by MetroPCS

Can I backup bootloader?

Hey xda/nexus community,
Is it possible to make a backup of bootloader? If it is, how?
No, I am not talking about kernel (boot.img is the kernel, correct?), system, recovery, or data. Bootloader.
My Nexus 5 came with bootloader version hhz11n. The factory image from Google (4.4.4) has bootloader version hhz11k.
I have no idea how different these two are, but since hhz11n image can't be found anywhere, I want to back it up before flashing to Lollipop or Marshmallow.
My Nexus is still running 4.4.4, bootloader unlocked, rooted, with TWRP installed.
Thanks for your help!
Not answering your question, I would like to ask why you would want to backup the bootloader, while they are available for download here?
Use TWRP

Is there a way to revert custom ROM to stock and keep the phone rooted?

Also, how can I tell what were the previous versions of Android that my phone had (STOCK)?
For example: there were several 5.1.1 versions or 5.0. versions - how do I know which one do I need?
Thanks.
The easiest way to have a routed rom would be to flash a stock rom from Google, flash twrp, and flash supersu from twrp.
audit13 said:
The easiest way to have a routed rom would be to flash a stock rom from Google, flash twrp, and flash supersu from twrp.
Click to expand...
Click to collapse
Sorry if I didn't explain myself - my phone is rooted and I have a custom ROM. What I want to do is to go back to stock ROM but keep it rooted.
Thanks.
Flash a stock rom, then just root the stock rom. There is no other way unless you flash a stock pre-rooted rom.
audit13 said:
Flash a stock rom, then just root the stock rom. There is no other way unless you flash a stock pre-rooted rom.
Click to expand...
Click to collapse
So you can't keep it rooted while flashing stock?
And how do you know which versions are for your phone (if I don't want to go back to the latest Marshmallow for example)?
You can only keep root when flashing stock if you find a prerooted stock image.
Google search for nexus factory images.
audit13 said:
You can only keep root when flashing stock if you find a prerooted stock image.
Google search for nexus factory images.
Click to expand...
Click to collapse
Yes, I know that I need to Google for factory image, but there are several images with the same release. For example, there are three 5.1.1. (LMY48B, LMY48I and LMY48M). Same with 6.0.0. and 4 X 6.0.1 version. How do you know which one is for my device?
Thanks.
Any stock image for hammerhead will work on a hammerhead device. The reason it will delete root is you will have to flash system, and unless the system image you flash is prerooted, no more root.
wangdaning said:
Any stock image for hammerhead will work on a hammerhead device. The reason it will delete root is you will have to flash system, and unless the system image you flash is prerooted, no more root.
Click to expand...
Click to collapse
Thanks!
Just trying to understand that difference between the different versions, or are these simply system updates, from XXX29K to XXX29S for example?
Changes in the android version 5.0->5.1->6.0 are fairly large system updates. Within 5.1.1 they are security patches.
If you have a rooted phone and talk about flashing, you should know this. Else you are a menace to your phone...
Root is a system modification - if you delete or reinstall the System partition, you'll lose root. But re-root is easy.
I recommend to read tutorials and get some knowledge before trying to root, flash or before asking those questions, where Senior xda-members just shake their heads.
The simple way to do what you seem to want is to back up all your important stuff (photos, etc.), install MMB29V (the latest March 1st 6.0.1 security version), install TWRP 3.0.0.0, and from TWRP flash SuperSU v2.70. It will take slightly longer than it's taken me to type this, but not much...
After that, when a new monthly security version comes out, flash system.img, boot.img & radio.img, and repeat the TWRP & SuperSU steps. No data loss.

Tablet broken , not fixable by Samsung but they said:

HI All,
Background : tablet is bootlooping. My SM-p900 can't be flashed back to working by Samsung, but the engineer said that knox is triggered, and something about the kernal, or ROM, being higher than the official ROM / bootloader (I'm really new to this so sorry if I'm mangling it!).
He said, I could flash a newer version, and that would probably work, previous attempts in odin, didn't work.
I can't flash a recovery, as nothing happens, nor can I flash a rom.
I'm not sure which one he is referring to as being too high a version, I think he said try higher than android 6, would that be the rom?
How can I flash the roms i find here, they're not odin flashable?
thanks Guys.
@Zophixan hi mate.
There is no higher stock than 5.0.2.
What happened when you tried to flash stock that you say it can't be flashed?
Did you try to flash multiple part or all in one file stock ROM?
My P900 it's running on LOS14.1.
I've flashed the official TWRP with Odin.
In TWRP I've flashed the ROM, Bitgapps and Magisk.

Question Flash custom rom + revert to stock (EU-variant)

I want to try to flash a custom rom, LineageOS or EvolutionX on my device. I miss the Pixel-feel… However I am not very familiar with this on OnePlus-devices. I know my way around unlocking and Fasboot. But if I don’t like the rom I try, how can I easily get back to stock? I see that there is no MSM-tool out for the EU variant, so that seems to be a no-go.
Is it possible to simply reflash stock OOS through fastboot after being on custom rom? This was how I did things on Pixel.
I guess you have only one option called MSM TOOL

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