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[Q] Question about overclocking~ (Note 2 N7100)

Hey xda~ :laugh: noobynoob here and I got a few questions about overclocking, here we go:
1. Is it safe?
Just bought a Note 2 N7100 and got it in a bootloop [scared me senseless, thank god i fixed it]
2. Kernels?
Um what are kernels and what do they differ?
3.Are all kernels for overclocking compatible for my device/rom?:fingers-crossed:
Note 2 N7100 with Dr.Ketan's Custom Rom v10.0 android version 4.4.2 (I currently have my eyes on this kernel: http://forum.xda-developers.com/showthread.php?t=2001838)
4.What kernel do you guys recommend (in case this one isnt compatible or if you just know a better one):victory:
I'm open to suggestions, I just want whats best for my phone
5.If something goes wrong flashing the kernel is there a chance I get bricked/stuck in a bootloop?
already messed up once when trying to flash my custom rom, im afraid itll happen again
ThanQ :laugh:

OmarKnows said:
Hey xda~ :laugh: noobynoob here and I got a few questions about overclocking, here we go:
1. Is it safe?
Just bought a Note 2 N7100 and got it in a bootloop [scared me senseless, thank god i fixed it]
2. Kernels?
Um what are kernels and what do they differ?
Click to expand...
Click to collapse
The kernel, in the simplest terms, is the piece of software in the operating system that tells the OS how to use the hardware.
Custom kernels typically take the stock kernel and modify the settings, and/or add features and setting parameters (often ported from other custom kernels).
3.Are all kernels for overclocking compatible for my device/rom?:fingers-crossed:
Note 2 N7100 with Dr.Ketan's Custom Rom v10.0 (I currently have my eyes on this kernel: http://forum.xda-developers.com/showthread.php?t=2001838)
Click to expand...
Click to collapse
I don't know. It's your responsibility to make sure it's compatible. I know Samsung makes many different versions of their Notes and Galaxy XS models (for different carriers, different regions of the world, etc), so a kernel for one version of the Note 2 might not work with your Note 2.
Further, just like it is with computer processors, not all are created equal. After manufacturing, processors are tested sorted into "bins" (literally) according to how well they work. Typically processors are all underclocked below their potential to some degree. That way they're not maxed out and overheating won't be a problem. Since they're underclocked, that means they can be overclocked to their true potential, but how far is a roll of the dice. One guy's Note 2 might have a processor from a higher bin and stably overclockable to 1.9GHz. Or you might have gotten one from a lower bin, and all you can OC it to is 1.7GHz. OC'ing too far will cause glitches and crashes.
4.What kernel do you guys recommend (in case this one isnt compatible or if you just know a better one):victory:
I'm open to suggestions, I just want whats best for my phone
Click to expand...
Click to collapse
I can't help you with that. It's best that you just read up on the kernel(s) you want to try, and by "read", I mean start from the first post, and read every post until you've read them all. That way you know about possible problems and how to sort them out if you encounter them.
5.If something goes wrong flashing the kernel is there a chance I get bricked/stuck in a bootloop?
already messed up once when trying to flash my custom rom, im afraid itll happen again
Click to expand...
Click to collapse
If you have a custom ROM, that means you have a custom recovery (TWRP, CWM, etc). From within the recovery you can do what's called a nandroid backup. It probably won't be labeled as "nandroid" (even though that's what we call it), but just a backup. This creates an "image" of your phone as it is when you run the backup. Store it on your SD card or PC (or both). If something goes wrong, you should still be able to reboot into recovery and restore your backup. Or, if you have a copy of your current kernel (custom ROMs sometimes have their own kernels, and might be available to download), you can just reflash the old kernel in recovery.

ThanQ
hmmm I guess ill need to read up more, I read on the kernels page something about needing a touchwiz based rom? what does that mean and how do I tell if my rom is tocuh based? As for that backup idea, that seems pretty useful, im gonna do that right now

OmarKnows said:
hmmm I guess ill need to read up more, I read on the kernels page something about needing a touchwiz based rom? what does that mean and how do I tell if my rom is tocuh based? As for that backup idea, that seems pretty useful, im gonna do that right now
Click to expand...
Click to collapse
TouchWiz is what Samsung calls its interfaces.

Trying to understand ROM and Kernel

Hello, i didn't find any answer so here's my question :
ROM :
What's the differences between 2 customs ROM ?
I mean, i have seen like 10 different ROM based on the same android version but i don't see any difference.
Why shouldn't I stay on Cyanogen ? I don't get it.
Kernel :
I think i kind of understand the benefit on a custom kernel (overclock, maybe better battery life ?) but isn't it too risky ?
How does kernel compatibility work ? Is it based on an Android version ? Do 5.0.0 kernel will be compatible with a 5.1.1 version ?
Do you really feel the difference compared to the stock cyanogen one ?
And my last question will be : does cyanogen 12 (and 12.1) have OTA update or do i have to flash new zip every day ?
Thanks !!

GinjiBan said:
Hello, i didn't find any answer so here's my question :
ROM :
What's the differences between 2 customs ROM ?
I mean, i have seen like 10 different ROM based on the same android version but i don't see any difference.
Why shouldn't I stay on Cyanogen ? I don't get it.
Kernel :
I think i kind of understand the benefit on a custom kernel (overclock, maybe better battery life ?) but isn't it too risky ?
How does kernel compatibility work ? Is it based on an Android version ? Do 5.0.0 kernel will be compatible with a 5.1.1 version ?
Do you really feel the difference compared to the stock cyanogen one ?
And my last question will be : does cyanogen 12 (and 12.1) have OTA update or do i have to flash new zip every day ?
Thanks !!
Click to expand...
Click to collapse
The ROMs might look the same but they're not. Features are implemented in different ways, plus there's a lot of unique code that you don't see which can affect many things, like speed and battery life. Also, you'll find that different ROMs have different feature sets. All in all it's up to you to decide which one is best for you, so have a look through them and pick one to test out. If you don't like it you can always flash another.
Custom kernels can offer extra features like overclocking, undervolting, fast charge while connected to a usb power source. There are risks involved, like if you overclock it can reduce the long term life of your CPU, undervolting too much will lead to instability.
CM12 (and 12.1) are nightlies which means there's a new build every day to update to (if you choose). You can either flash them manually or download via the OTA system. Not all ROMs have the OTA system.
Transmitted via Bacon

Thank you very much !!
Maybe i should dig more into the ROM's topic because their customs features are not listed anywhere.. That's too bad ^^
Do you know if all the gestures are implemented on CM 12 / 12.1 (not only double tap but all of them) ?

GinjiBan said:
Thank you very much !!
Maybe i should dig more into the ROM's topic because their customs features are not listed anywhere.. That's too bad ^^
Do you know if all the gestures are implemented on CM 12 / 12.1 (not only double tap but all of them) ?
Click to expand...
Click to collapse
Yes, as far as I know the gestures are implemented, they have been on all ROMs that I've tried anyway.
Transmitted via Bacon

timmaaa said:
Yes, as far as I know the gestures are implemented, they have been on all ROMs that I've tried anyway.
Transmitted via Bacon
Click to expand...
Click to collapse
Thanks again !
How come custom kernel like Franco's one can improve your battery life ? I've seen everyone talking about it ..

GinjiBan said:
Thanks again !
How come custom kernel like Franco's one can improve your battery life ? I've seen everyone talking about it ..
Click to expand...
Click to collapse
There are various differences between stock CM kernel and custom kernels, far too many for me to go into. Honestly though, the difference in battery life really isn't all that much. I never use a custom kernel and I still get great battery life.
Transmitted via Bacon

How to know which kernel to use ?

Hi guys
I have a old Moto g 1st gen (xt1032)
And been trying to get it running now but with not much luck.
The bootloader is unlocked and twrp installed and I installed a stock rom but it keep crashing about once or twice a day so I formatted everything and installed another rom can't remember the name right now but was comparable for my model .
And that won't get passed the black "android" screen
So been looking into it and people mention kernels but I haven't got a clue about them tbh so how can I tell which kernel I need or do they suit all ROMs
Can anyone suggest a matching kernel and rom
Cheers

steve.loveday said:
Hi guys
I have a old Moto g 1st gen (xt1032)
And been trying to get it running now but with not much luck.
The bootloader S unlocked and twrp installed and I installed a stock rom but it keep crashing about once or twice a day so I formatted everything and installed another rom can't remember the name right now but was comparable for my model .
And that won't get passed the black "android" screen
So been looking into it and people mention kernels but I haven't got a clue about them tbh so how can I tell which kernel I need or do they suit all ROMs
Can anyone suggest a matching kernel and rom
Cheers
Click to expand...
Click to collapse
I'm a lot really late but just a try a few different ROMs and make sure they say XT1032 or Falcon. ID crisis and Exodus are good 6.x ROM that are very stable. As for kernels, unless you really want to do some low level tweaks that require kernel intergretaion like Overclock, DT2W, CPU governer, etc., I wouldn't worry about it.
If you DO want a kernel I can't recommend ZERO Byte kernel by @BryanByteZ enough. Under volt/clock and over/volt clock, DT2W, it's got everything. Works great with Exodus

Mattwmaster58 said:
I'm a lot really late but just a try a few different ROMs and make sure they say XT1032 or Falcon. ID crisis and Exodus are good 6.x ROM that are very stable. As for kernels, unless you really want to do some low level tweaks that require kernel intergretaion like Overclock, DT2W, CPU governer, etc., I wouldn't worry about it.
If you DO want a kernel I can't recommend ZERO Byte kernel by @BryanByteZ enough. Under volt/clock and over/volt clock, DT2W, it's got everything. Works great with Exodus
Click to expand...
Click to collapse
Thanks for the recommendation but i dont have overvolt
---------- Post added at 01:10 ---------- Previous post was at 01:04 ----------
steve.loveday said:
Hi guys
I have a old Moto g 1st gen (xt1032)
And been trying to get it running now but with not much luck.
The bootloader S unlocked and twrp installed and I installed a stock rom but it keep crashing about once or twice a day so I formatted everything and installed another rom can't remember the name right now but was comparable for my model .
And that won't get passed the black "android" screen
So been looking into it and people mention kernels but I haven't got a clue about them tbh so how can I tell which kernel I need or do they suit all ROMs
Can anyone suggest a matching kernel and rom
Cheers
Click to expand...
Click to collapse
Sooo about that a good start is to flash the latest stock 5.1 then flash twrp and choose a 6.X rom (based on cm13) and that depends of your likes and wishes if you want a stable like rock rom i recommend AOSP+OMS 6.X/EXODUS/VanirAOSP if you want customizations there is Ressurection Remix,Dirty Unicorns and others, you just "need" to flash other kernel if you want more advanced features. This is just a recommendation for roms but lucky we have Kitkat,lollipop,marshmallow and nougat roms.

Thanks for the replies guys
I'm beginning to think I have a hardware problem on the phone.
I installed 3 versions of stock 5.1 on it last night
Eu,Brazil,and US I think they were they all install without errors
But only the Eu one boots up the other 2 stay on the "android" black screen.
The one that does boot us unstable though and crashes quite often .
That's why I thought about kernels and maybe it was that as I'm not sure if I need a certain one on my phone or any compatible one will do.

BryanByteZ said:
Thanks for the recommendation but i dont have overvolt [/QOUTE]
Oh...Woops
Click to expand...
Click to collapse

steve.loveday said:
Thanks for the replies guys
I'm beginning to think I have a hardware problem on the phone.
I installed 3 versions of stock 5.1 on it last night
Eu,Brazil,and US I think they were they all install without errors
But only the Eu one boots up the other 2 stay on the "android" black screen.
The one that does boot us unstable though and crashes quite often .
That's why I thought about kernels and maybe it was that as I'm not sure if I need a certain one on my phone or any compatible one will do.
Click to expand...
Click to collapse
Well I already passed on that I change my bootloader to the one from BR stock 5.1 and now everything works fine. Try to change data partition to f2fs file system.

Z5 custom kernels.... which one are out there?

Hellou !
I am curious to which kernel are out there for z5?
Curently settling for nougat rom, .106 exactly and androplus kernel .43, .42 results in bootloop, is there more kernels to find in active development?
Curious for other custom roms too. (let say stock mm,...)

stipi69 said:
Hellou !
I am curious to which kernel are out there for z5?
Curently settling for nougat rom, .106 exactly and androplus kernel .43, .42 results in bootloop, is there more kernels to find in active development?
Curious for other custom roms too. (let say stock mm,...)
Click to expand...
Click to collapse
For the last nougat there is not a kernel. There is a lot of custom roms but there are LOS based so are not stock. With those roms you can use a modified kernel.

https://forum.xda-developers.com/showpost.php?p=73841170&postcount=2216

Thank you for heads up, i kinda feel you, z5 is a great, but horrible phone in one. I hate it in mid day when battery dries but love it mornings when i bake egs with it
But thanks to you and other devoted devs z5 goes through, just barely thogh, i will remain Sony user but next model i buy i will check twice and then recheck again.

Coming full circle

Well, I have owned my XT1625 for one year and four months. After countless runs with both custom Nougat and Oreo ROMs I am back on rooted stock (December -13 version) with ElementalX kernel. To put it simply, everything just works. Period. No issues with the camera or GPS. Performance is great and battery life is as good or better than any custom ROM I have tried bar none.
Guess the grass isn't always greener.

I've had a similar experience with the June, September and December 2017 stock Motorola ROMs. I've found the rooted stock ROM to be quick, and with the ElementalX kernel/EX Kernel Manager, I can tune the CPU down to not run as hot (1344 MHz or 1094 MHz/1209 MHz ) magisk 15.3 runs invisibly and stably too.
Whilst it would be nice for ElementalX to be updated to the Sept 2017 kernel code, it still runs well, and the only thing I miss - themes - is hopefully coming in the Oreo update with Substratum/Andromeda support

echo92 said:
themes - is hopefully coming in the Oreo update with Substratum/Andromeda support
Click to expand...
Click to collapse
Still you can use with substratum legacy support, it makes no difference than installing in system. Right?

echo92 said:
I've had a similar experience with the June, September and December 2017 stock Motorola ROMs. I've found the rooted stock ROM to be quick, and with the ElementalX kernel/EX Kernel Manager, I can tune the CPU down to not run as hot (1344 MHz or 1094 MHz/1209 MHz ) magisk 15.3 runs invisibly and stably too.
Whilst it would be nice for ElementalX to be updated to the Sept 2017 kernel code, it still runs well, and the only thing I miss - themes - is hopefully coming in the Oreo update with Substratum/Andromeda support
Click to expand...
Click to collapse
True that echo92! There are several other little tweaks to the UI and bars that I miss (advanced boot for one). But I enjoy being able to use my GPS or take a pic/video without it crashing. I truly hope we do see an stock Oreo update. But even if we don't I am content to stay on my current setup until I replace my phone.

I had my time with CM and Lineage ROMs but if someone wants stability and functionality the only option is the stock.
Root as noted above.

I'm on December patch but with September modem, with December my phone remains in 3G on closed builds.
Now I'm with 4G all day.

echo92 said:
I've had a similar experience with the June, September and December 2017 stock Motorola ROMs. I've found the rooted stock ROM to be quick, and with the ElementalX kernel/EX Kernel Manager, I can tune the CPU down to not run as hot (1344 MHz or 1094 MHz/1209 MHz ) magisk 15.3 runs invisibly and stably too.
Whilst it would be nice for ElementalX to be updated to the Sept 2017 kernel code, it still runs well, and the only thing I miss - themes - is hopefully coming in the Oreo update with Substratum/Andromeda support
Click to expand...
Click to collapse
Could you please link me how you rooted and installed Magisk? I've tried few times but magisk was a major issue... and I had to install a different "su" app, otherwise bootlooplooplooploop...

imonkeys said:
Could you please link me how you rooted and installed Magisk? I've tried few times but magisk was a major issue... and I had to install a different "su" app, otherwise bootlooplooplooploop...
Click to expand...
Click to collapse
To flash magisk on stock I think you need a custom kernel like ElementalX. Correct me if I'm wrong.

DECHTECH said:
To flash magisk on stock I think you need a custom kernel like ElementalX. Correct me if I'm wrong.
Click to expand...
Click to collapse
Yup. only "stable" way to root is by flashing a different kernel.
Also came back full circle and agree that it's sadly the only way to get a fully functional phone. Additional features can be added through xposed but it breaks some vital apps for me. So it's #Stock+Root all the way for me.

imonkeys said:
Could you please link me how you rooted and installed Magisk? I've tried few times but magisk was a major issue... and I had to install a different "su" app, otherwise bootlooplooplooploop...
Click to expand...
Click to collapse
As DECHTECH and halifage have mentioned, you need a custom kernel or a reliable way to disable DM verity on the stock kernel to flash magisk. Else, if you try to flash magisk onto an unmodified stock Motorola kernel, you'll trip the anti rooting protections and cause a bootloop.
The straightforward way is to flash ElementalX v 1.04 kernel in TWRP (or the vegito kernel) before flashing magisk or SuperSU. Here's a general procedure if you want a guide https://forum.xda-developers.com/showpost.php?p=72496111&postcount=270. It is a bit old, but the general steps have worked on stock ROMs up to December 2017 in my experience. Of course, if you've already unlocked, no need to do it again
I don't know if you could use magisk (at least v14/15) to patch the stock boot kernel to remove DM verity, and so be able to root on a modified stock kernel, something to try. However, ElementalX and vegito give you plenty of options to tune your device if you do wish to, which the stock kernel may not provide. As always before flashing anything, make a backup in TWRP.

echo92 said:
As DECHTECH and halifage have mentioned, you need a custom kernel or a reliable way to disable DM verity on the stock kernel to flash magisk. Else, if you try to flash magisk onto an unmodified stock Motorola kernel, you'll trip the anti rooting protections and cause a bootloop.
The straightforward way is to flash ElementalX v 1.04 kernel in TWRP (or the vegito kernel) before flashing magisk or SuperSU. Here's a general procedure if you want a guide https://forum.xda-developers.com/showpost.php?p=72496111&postcount=270. It is a bit old, but the general steps have worked on stock ROMs up to December 2017 in my experience. Of course, if you've already unlocked, no need to do it again
I don't know if you could use magisk (at least v14/15) to patch the stock boot kernel to remove DM verity, and so be able to root on a modified stock kernel, something to try. However, ElementalX and vegito give you plenty of options to tune your device if you do wish to, which the stock kernel may not provide. As always before flashing anything, make a backup in TWRP.
Click to expand...
Click to collapse
Ok, thanks a lot.
I've unlocked, but when the update stock come out in December I put everything back to stock wit locked bootloader.
Now I suppose I would loose all my data...

I think this thread is answering my question, but I just got an XT1625 (non-Amazon) with Marshmallow on it. As soon as I fired it up, I had the OTA update notification for Nougat. Rather than upgrading, I just went ahead and unlocked and rooted because it seemed much easier on 6 than 7. Sounds like this may have been the right call, but am I missing out on anything by keeping MM?

For everyone who is reverting to stock due to issues on custom ROMs: I'm currently running AICP Nougat paired with the Vegito Kernel and rooted, but I have ZERO bugs, the ROM is super smooth and battery life is awesome. Everything seems to just work.
I ponder as to what issues people have on custom roms. Oreo has some issues but most nougat LOS and AOSP based ROMS work fine without small issues, at least for me on my XT1642.

DECHTECH said:
For everyone who is reverting to stock due to issues on custom ROMs: I'm currently running AICP Nougat paired with the Vegito Kernel and rooted, but I have ZERO bugs, the ROM is super smooth and battery life is awesome. Everything seems to just work.
I ponder as to what issues people have on custom roms. Oreo has some issues but most nougat LOS and AOSP based ROMS work fine without small issues, at least for me on my XT1642.
Click to expand...
Click to collapse
My main issue with the custom ROMS is battery life. I ran AICP for a couple of months and it was one of the most stable. But stock still provides me better battery life. The issues I have had with various Nougat Custom ROMs are related to performance when gaming, cameras not working 100%, losing access to some of the apps I run, and, as mentioned, battery life. Not all of them have all of these issues but they all have at least one. Since I can get the access to all of my apps and what I want to customize and modify through my current setup as well as the best battery life I will stick to it.
As I said in my initial post, it is not a decision I made lightly. Only after trying almost every custom Nougat ROM and 3 different Oreo ROMs did I come back to Stock. It was a 16 month journey. In all fairness, in the beginning I got better battery life on the custom ROMs. But that is not the case with the latest available stock.
In comparison, on my Samsung T813 Galaxy S2 Tablet, the custom ROM I use blows stock out of the water with all features.

CM14.1 builds had better battery life compared to LineageOS and Oreo based custom roms. That's what I observed over more then one year.
Proof: https://drive.google.com/folderview?id=0B4Zy8uoEfFKLLXF4VkVJNHlOdTQ that was cm-14.1-20161224-NIGHTLY-athene.zip

strongst said:
CM14.1 builds had better battery life compared to LineageOS and Oreo based custom roms. That's what I observed over more then one year.
Click to expand...
Click to collapse
Which makes no sense because Lineage was based on CM wasn't it? And CM is no more.

pastorbob62 said:
Which makes no sense because Lineage was based on CM wasn't it? And CM is no more.
Click to expand...
Click to collapse
Sure I know that lineage was based on cm, but why could be cm not be better in terms of battery life? Only why cm is dead?
I only posted this to make clear that not every evolution of software is good(here in terms of battery life).

strongst said:
Sure I know that lineage was based on cm, but why could be cm not be better in terms of battery life? Only why cm is dead?
Click to expand...
Click to collapse
It could be better than Lineage and Oreo based ROMs. I just don't think it is better than the current setup I am now running. What is the latest version of CM currently available? Late 2016. In my book that makes it dead for newer devices. The code in Lineage is essentially CM and any pure CM is outdated as far as security and features.
strongst said:
I only posted this to make clear that not every evolution of software is good(here in terms of battery life).
Click to expand...
Click to collapse
True. But I have seen no proof that CM battery life is better than what I am now getting now with the latest stock/ElementalX setup. In fact I do not recall ever getting better than about 1.8% drain per hour overall with CM. I am currently getting 1.1% drain per hour overall.
Also, I can't access your link because I don't have the permissions.

pastorbob62 said:
It could be better than Lineage and Oreo based ROMs. I just don't think it is better than the current setup I am now running. What is the latest version of CM currently available? Late 2016. In my book that makes it dead for newer devices. The code in Lineage is essentially CM and any pure CM is outdated as far as security and features.
True. But I have seen no proof that CM battery life is better than what I am now getting now with the latest stock/ElementalX setup. In fact I do not recall ever getting better than about 1.8% drain per hour overall with CM. I am currently getting 1.1% drain per hour overall.
Also, I can't access your link because I don't have the permissions.
Click to expand...
Click to collapse
Sorry: https://drive.google.com/folderview?id=0B4Zy8uoEfFKLLXF4VkVJNHlOdTQ
Latest version is the one I posted above. I know your setup and usage behavior is different. But for my setup and usage behavior good old cm14.1 was better then everything today and also stock nougat for example. That it's outdated is known and i don't advertise to install cm14.1 anymore :good:

strongst said:
Sorry: https://drive.google.com/folderview?id=0B4Zy8uoEfFKLLXF4VkVJNHlOdTQ
Latest version is the one I posted above. I know your setup and usage behavior is different. But for my setup and usage behavior good old cm14.1 was better then everything today and also stock nougat for example. That it's outdated is known and i don't advertise to install cm14.1 anymore :good:
Click to expand...
Click to collapse
:good::good::good::good::good: