Development [ROOT] [TWRP] [KERNEL] [GSI] for SM-A127f (a12s)

[physwizz]

Root Method

Root for all Exynos 850 devices.

Root for all Exynos 850 devices. A. Root part 1 - Preparing the file I accept no responsibility for bricked phones but I will help you to recover. 1. Download the exact firmware (including upgrade date) for your device from https://samfrew.com...

forum.xda-developers.com

Twrp and Kernel

Kernel and TWRP for a127f u2 (Exynos 850)

I have built a custom kernel for the a127f Exynos 850 which should work on the m127f. I've also included a link to more custom recoveries in post#2 physwizz a12s kernel version 4 Based on a127f NOT for baseband u3 or higher For OneUI 3.1 (...

forum.xda-developers.com

Latest twrp

Afaneh TWRP for a12s (Exynos 850)

Afaneh TWRP NOT for baseband u3 or greater (Working u3/u4 version on post #2) Download tar file. Extract recovery.img from tar file Method 1. If you have already installed recovery and decrypted. 1. Boot to recovery. 2. Install recovery.img 3...

forum.xda-developers.com

Root Method in post#2
afaneh92 TWRP in post #2
GSIs in post#3
Kernel Version 2 & 3 in post #5
Kernel version 4 in post #11
Install kernel without TWRP in post#21
TWRP (new) in post#6
Skyhawk recovery (new) in post #22
Orange Fox (new) post #24

Note
All of these procedures have been tested on the a127f with u2 baseband
They will probably all work on the m127f as well.


@physwizz

Recoveries for U2 baseband - Working

[RECOVERY][UNOFFICIAL] TWRP , OrangeFox and Skyhawk [Samsung-Exyons-850][m12s][a12s][SM-M127X][SM-A127X]

TWRP , OrangeFox and Skyhawk for Samsung A12/M12 Exyons850 * I am not responsible for bricked devices, dead SD cards, * thermonuclear war, or you getting fired because the alarm app failed. Please * do some research if you have any concerns...

forum.xda-developers.com

Recoveries for U3 baseband - Still being tested

[RECOVERY][UNOFFICIAL] TWRP , OrangeFox and Skyhawk [Samsung-Exyons-850][m12s][a12s][SM-M127X][SM-A127X]

TWRP , OrangeFox and Skyhawk for Samsung A12/M12 Exyons850 * I am not responsible for bricked devices, dead SD cards, * thermonuclear war, or you getting fired because the alarm app failed. Please * do some research if you have any concerns...

forum.xda-developers.com

All recoveries contain physwizz Kernel

 

[physwizz]

Root Method for all Exynos 850 devices.

A. Root part 1 - Preparing the file

I accept no responsibility for bricked phones but I will help you to recover.

1. Download the exact firmware (including upgrade date) for your device from https://samfrew.com or https://www.samfirmware.net/ or https://www.full-repair-firmware.com/search?q=A20 or

Samsung Firmware Download - Lastest official firmware update

Samsung Firmware Download ⭐ Official and fast update ⭐ Lastest and old version ⭐ Max speed and free download ⭐ Best Samsung Galaxy website

samfw.com

2. Download patched magisk
3. Use zarchiver to extract the apxxxxxx....md5 section from the firmware.
4. Use patched magisk to patch the ap section. Allow the extra files.
Click on install and select patch file.
The output will be a patched tar file.

B. To Unlock Bootloader
1. Activate developer options by going to settings, about phone, software information and tapping on build number 7 times.
On phone developer options in settings allow OEM unlocking and enable usb debugging by moving both
sliders RIGHT
If you don't see the OEM unlock
-Disable Auto System Update
-Then disable Automatic date and time (Found in General Management) > then set the time back 14 days
- Connect to the internet
-Go to software update then check for update and wait a long time till it registers the device on server
-Once it's registered the OEM Unlock should be visible in the Developer Options
then connect phone to PC
2. Reboot into download mode by holding down both Vol up and Vol down
(You might need to long press vol up to unlock bootloader)
then press vol up to continue
Reboot and skip through the setup process.


C. Root part 2

Reboot into download mode again
6. Flash the patched ap tar file using special Odin.

https://forum.xda-developers.com/attachments/odin3-v3-14-1_3b_patched-zip.5158507/

(Click on the ap button and choose the patched tar file. Press start)
7. Reboot.
8. Skip all the way through the set-up process.




D. TWRP installation for a127f and m127f (may not work for a127f/DSN)

Make sure your system has fully completed the installation process and all apps have been installed

1. Download the afaneh92 zip file.Unzip the tar from the zip.
2. Extract the recovery.img
3. Install TWRP app form the playstore
4. Choose Install TWRP
5. Choose file to flash.(don't select device)
6. Select recovery.img.
7. Reboot to recovery.
8. Mount system (Press mount then choose system)
9. Tap on Wipe, tap on format data, type YES. (Not just wipe data)
10. Tap on Advanced then terminal.
11. Type multidisabler. Wait for it to finish. Type multidisabler again. Go to main menu
Reboot to recovery (tap on reboot, tap on recovery)
Ignore the keyrefuge error message.
12. Reboot and go completely through the setup process. Wait for downloading to finish. This may take up to an hour. You can see the progress by pulling down from the top.
13. Reboot into recovery and Backup boot, data, super and dtbo


@physwizz

 

[physwizz]

Installing a GSI

1. Unzip img file
2. Backup boot, data and super from TWRP.
Wipe data from twrp
3. Install IMG.
4. Install my kernel
5. Reboot

I have installed lineages and pixel experience

List of GSIs

Generic System Image (GSI) list · phhusson/treble_experimentations Wiki

Notes about tinkering with Android Project Treble. Contribute to phhusson/treble_experimentations development by creating an account on GitHub.

github.com

@physwizz

 

[LAST_krypton]

deleted

 

[physwizz]

physwizz a12s kernel version 2
Based on a127f

For OneUI 3.1
(May also work for GSIs)


Samsung securities disabled
More CPU governors
Conservative, On-demand, Userspace, powersave, performance, energy_step, shedutil
Optimised for performance
Overclocked for performance
Underclocked for battery
CPU: 247MHz - 2210MHz


Kernel

physwizz - Repositories

physwizz has 53 repositories available. Follow their code on GitHub.

github.com

@physwizz


physwizz a12s kernel version 3
Based on a127f

For OneUI 3.1
(May also work for GSIs)


Samsung securities disabled
More CPU governors
Conservative, On-demand, Userspace, powersave, performance, energy_step, shedutil
Optimised for performance
Overclocked for performance
Underclocked for battery
CPU: 247MHz - 2210MHz
lz4 compression added to zram

For Zram
Go to HKtweaks- virtual memory
Turn off zram
increase swappiness to 200
choose lz4
increase size to 4096
turn on Zram


Kernel

physwizz - Repositories

physwizz has 53 repositories available. Follow their code on GitHub.

github.com

@physwizz

 

[physwizz]

TWRP
From @(Sri Lanka)

(MTP not working)

Installation
Unzip files
Extract recovery.img

Method 1.
If you have already installed afaneh92 TWRP and decrypted.
1. Boot to recovery.
2. Install recovery.img
3. Choose recovery partition
4. Reboot to recovery

Method 2.
From the start

1. Download firmware
2. Extract ap file.
3. Patch with magisk
4. Flash with Odin
5. Download recovery.img
6. Install TWRP app
7. Install TWRP
8. Choose file to flash.(don't select device)
9. Select recovery.img.
10. Reboot to recovery.
11. Format data
12. Install multidisabler zip
Or dmverity
13. Reboot to recovery
Done


@physwizz

 

[honzazkrumlova]

6. Install the TWRP tar file from patched Odin.

9. Mount system etc

Hi,

I am quite noob, IT but not developer, with some knowledge of linux, rooted so far 3 devices with some imagination whats the process about. As far as I know, kernel and recovery are those special partitions, I should know exactly what am doing, because I can brick my phone almost permanently. So pardon me for basic question (I can of course study in another thread, but still will not be sure its 100% accurate for this device)....

6. Install TWRP - some detailed instruction will be welcomed (lasttime I saw TWRP, it was onetime run by adb/fastboot command with red colored mention DO NOT enable Write, stay read only) - BL, AP, CP?
9. Mount etc.... some details?
4. Install kernel .... some details?

And just to ensure myself understanding, TWRP become permanent in recovery partition, updated kernel comes with some optimizing - but no special changes has to be made for whole firmware. And A12s vs/aka A127F/DS versus my device A127F/DSN .... its not important difference?

Thanks

 

[physwizz]

Hi,

I am quite noob, IT but not developer, with some knowledge of linux, rooted so far 3 devices with some imagination whats the process about. As far as I know, kernel and recovery are those special partitions, I should know exactly what am doing, because I can brick my phone almost permanently. So pardon me for basic question (I can of course study in another thread, but still will not be sure its 100% accurate for this device)....

6. Install TWRP - some detailed instruction will be welcomed (lasttime I saw TWRP, it was onetime run by adb/fastboot command with red colored mention DO NOT enable Write, stay read only) - BL, AP, CP?
9. Mount etc.... some details?
4. Install kernel .... some details?

And just to ensure myself understanding, TWRP become permanent in recovery partition, updated kernel comes with some optimizing - but no special changes has to be made for whole firmware. And A12s vs/aka A127F/DS versus my device A127F/DSN .... its not important difference?

Thanks

Thanks for the feedback.
I'll add more detail shortly

 

[physwizz]

Hi,

I am quite noob, IT but not developer, with some knowledge of linux, rooted so far 3 devices with some imagination whats the process about. As far as I know, kernel and recovery are those special partitions, I should know exactly what am doing, because I can brick my phone almost permanently. So pardon me for basic question (I can of course study in another thread, but still will not be sure its 100% accurate for this device)....

6. Install TWRP - some detailed instruction will be welcomed (lasttime I saw TWRP, it was onetime run by adb/fastboot command with red colored mention DO NOT enable Write, stay read only) - BL, AP, CP?
9. Mount etc.... some details?
4. Install kernel .... some details?

And just to ensure myself understanding, TWRP become permanent in recovery partition, updated kernel comes with some optimizing - but no special changes has to be made for whole firmware. And A12s vs/aka A127F/DS versus my device A127F/DSN .... its not important difference?

Thanks

I hope the method is now OK.
please contact me if any further help is needed

Galaxy a12s, m12 & a21s (Exynos 850) Resources

Everything you need for the SM-a127f and SM-m127f

t.me

Galaxy A12s, M12 & A21s (Exynos 850) Development

For SM-a127f & SM-m127f

t.me

 

[physwizz]

More detailed root and twrp instructions in post #2

 

[physwizz]

physwizz a12s kernel version 4
Based on a127f U1 binary

For OneUI 3.1
( also works for GSIs)


Samsung securities disabled
More CPU governors
Conservative, On-demand, Userspace, powersave, performance, energy_step, shedutil
Optimised for performance
Overclocked for performance
Underclocked for battery
CPU: 130MHz - 2210MHz
lz4 compression added to zram
Ready for spectrum installation

Installation
Method 1
Install from TWRP


Method 2
Install adb tools on pc
Connect to PC
Copy zip file to adb folder on pc
Open terminal on pc
Navigate to adb folder
Type
adb sideload name.zip


For Zram
Go to HKtweaks- virtual memory
Turn off zram
increase swappiness to 200
choose lz4
increase size to 4096
turn on Zram


Kernel

physwizz - Repositories

physwizz has 53 repositories available. Follow their code on GitHub.

github.com

@physwizz

 

[IchZerowan]

Backup boot, data, super and dtbo

Thanks! I finally got the TWRP on my SM-A127F, though I cannot perform the last step: I get errors "Failed to mount '/data' (Invalid argument)" and "Failed to mount '/keyrefuge' (Invalid argument)". Any ideas?

UPD: not sure if it's OK, but I changed /data filesystem to ext4 and it worked well.

 

[physwizz]

Thanks! I finally got the TWRP on my SM-A127F, though I cannot perform the last step: I get errors "Failed to mount '/data' (Invalid argument)" and "Failed to mount '/keyrefuge' (Invalid argument)". Any ideas?

UPD: not sure if it's OK, but I changed /data filesystem to ext4 and it worked well.

Format data
Type yes
Then GO to advanced
terminal and type multidisabler twice
Reboot to recovery

Ignore keyrefuge

 

[honzazkrumlova]

Thanks! I finally got the TWRP on my SM-A127F, though I cannot perform the last step: I get errors "Failed to mount '/data' (Invalid argument)" and "Failed to mount '/keyrefuge' (Invalid argument)". Any ideas?

UPD: not sure if it's OK, but I changed /data filesystem to ext4 and it worked well.

Can you post, how exactly you did it (changed to ext4)
Based on your mention, I tried TWRP, WIPE, Advanced wipe, Change or repair filesystem, Change, to EXT4. No luck.

 

[physwizz]

Thanks! I finally got the TWRP on my SM-A127F, though I cannot perform the last step: I get errors "Failed to mount '/data' (Invalid argument)" and "Failed to mount '/keyrefuge' (Invalid argument)". Any ideas?

UPD: not sure if it's OK, but I changed /data filesystem to ext4 and it worked well.

I didn't change mine to ext4.
I just left it as it was

 

[IchZerowan]

how exactly you did it

I tried exactly the same steps you mentioned, and it worked.

 

[honzazkrumlova]

I tried exactly the same steps you mentioned, and it worked.

Well, but...
In original physwizz instructions, there are steps and I would be greatfull to provide some details
Those key moments

0. "Install all apps, etc"
A. Wipe / Format Data / yes
B. Multidisabler twice
and your workaround C. Change FS to EXT4

My experiments was like>
0+A+B... system bricked (or 10min long bootloop)
0+A+B+C ..... bricked (but TWRP at least sees Internat storage with 50GB capacity)

Then, I said myself, well, C mean I wiped, never mind, lets alter it like
A+B+C+ call clean wipe (but on ext4 Data partition.... but how?)

Well, tried> A+B+C+ Wipe, Wipe Factory Reset.
no change, bricked.

I also tried/experiemnt
A+restart .... bricked
A+B+restart .... bricked
B+restart .... bricked

So, can you please write little bit details?
Thanks!

 

[IchZerowan]

Well, but...
In original physwizz instructions, there are steps and I would be greatfull to provide some details
Those key moments

0. "Install all apps, etc"
A. Wipe / Format Data / yes
B. Multidisabler twice
and your workaround C. Change FS to EXT4

My experiments was like>
0+A+B... system bricked (or 10min long bootloop)
0+A+B+C ..... bricked (but TWRP at least sees Internat storage with 50GB capacity)

Then, I said myself, well, C mean I wiped, never mind, lets alter it like
A+B+C+ call clean wipe (but on ext4 Data partition.... but how?)

Well, tried> A+B+C+ Wipe, Wipe Factory Reset.
no change, bricked.

I also tried/experiemnt
A+restart .... bricked
A+B+restart .... bricked
B+restart .... bricked

So, can you please write little bit details?
Thanks!

I currently wasn't able to run any GSIs on my phone, so not sure what to do next. I think, backing up /data is useless since it's empty (I tried ls from the terminal). Next attempt I gonna restore the state using backup or even odin, and back up only boot, super, and dtbo without changing the FS. At least, the default OneUI boots this way, so I hope one of the GSIs will boot as well. I gonna experiment on this a bit later.

 

[honzazkrumlova]

I tried exactly the same steps you mentioned, and it worked.

Well, I have had hope, when you written "worked". Hope that mounting /data is possible.
Well, backup /data ist not useless now, its not possible, because if you try, falls into error because unmountable.
Lets say, you wanna backup those special partition in case, your experiment with kernels go wrong, so far so good.
My intention was pretty less advanced, I wanna backup data for a reason - well, these days some apps goes way I dont want you, I would use /data backup in case, I want restore previous version of some app. That + regular backup, why backup data/files/setting, when I can backup whole system, lets say once a month.

Anyway, changing /data partition to ext4 DID something and CHANGED something (capacity of internal storage), so its maybe workaround about where the solution stays, I have found some older thread about similar problem in TWRP and solution that changing to EXT2, then EXT4 would help. Will experiment and let you know, if succeed.

 

[physwizz]

Some screenshots from afaneh92 twrp.