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A12s Exynos 850 Development Kernel and TWRP for a127f u2 (Exynos 850)

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physwizz

Senior Member
Sep 16, 2013
3,307
727
Sydney
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
( 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
 

Attachments

  • physwizz_a127f_kernel_v4.zip
    17.6 MB · Views: 66
Last edited:

physwizz

Senior Member
Sep 16, 2013
3,307
727
Sydney
Root and TWRP
NOT for baseband u3 or higher

Download zip 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. Choose recovery partition
4. Reboot to recovery

Method 2.

From the start
1. Download firmware
2. Extract ap file.
3. Patch with special magisk
4. Flash with Odin
5. Download tar and extract 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.
10. Wipe, format data, type YES.
11. Advanced, terminal.
Type multidisabler (twice).
Reboot to recovery
12. Backup boot, data, super and dtbo


@physwizz

Links

A127f on XDA

More custom recoveries

M127f on telegram
 

Attachments

  • twrp-3.5.2_11-1_afaneh92-R-a12s-2021-12-06.zip
    29 MB · Views: 46
  • Magisk_patched_for_A21S.apk
    6.3 MB · Views: 18
Last edited:

Hausemaster

Senior Member
Dec 2, 2020
329
72
I know that one brave person has downloaded this kernel.
Any feedback?
Well, you are right, I did download it but I'm scared to try, I think once I unlock the bootloader,
1. I'll not be able to re-lock it
2. I only have a raspberry Pi 3B+ and hence can't use Odin to restore of something goes wrong
3. I can't run the banking apps anymore due to Knox trip status
4. And if Knox trips, going to stock fully is going to be impossible, and Knox features will be unusable
And to top these all off, it's the new phone of my parents, they had a moto they previously lost, if their apps don't work after I do something, I'll be screwed over... :/
 

physwizz

Senior Member
Sep 16, 2013
3,307
727
Sydney
Well, you are right, I did download it but I'm scared to try, I think once I unlock the bootloader,
1. I'll not be able to re-lock it
2. I only have a raspberry Pi 3B+ and hence can't use Odin to restore of something goes wrong
3. I can't run the banking apps anymore due to Knox trip status
4. And if Knox trips, going to stock fully is going to be impossible, and Knox features will be unusable
And to top these all off, it's the new phone of my parents, they had a moto they previously lost, if their apps don't work after I do something, I'll be screwed over... :/
lol
I understand
 

Jeremia121

Member
Apr 11, 2018
6
0
I know that one brave person has downloaded this kernel.
Any feedback?
I have the Galaxy M127F / DS and I have problems installing a custom recovery, I have tried many but cannot finish successfully. I have root and it was as far as I could go, I miss my A20, by the way the binary is 2.

When I install any of the recovery that you uploaded, it sends me the statement "Recovery: No footer detected. (0)
Recovery: Error verifying vbmeta image: invalid vbmeta header (6) "

I don't know why this is, I hope you can help me, please.
 

physwizz

Senior Member
Sep 16, 2013
3,307
727
Sydney
I have the Galaxy M127F / DS and I have problems installing a custom recovery, I have tried many but cannot finish successfully. I have root and it was as far as I could go, I miss my A20, by the way the binary is 2.

When I install any of the recovery that you uploaded, it sends me the statement "Recovery: No footer detected. (0)
Recovery: Error verifying vbmeta image: invalid vbmeta header (6) "

I don't know why this is, I hope you can help me, please.
Did you root with the patched ap file
(Patched by special magisk I posted)
 
Last edited:

physwizz

Senior Member
Sep 16, 2013
3,307
727
Sydney
 

physwizz

Senior Member
Sep 16, 2013
3,307
727
Sydney
V5
 

Attachments

  • Screenshot_20211204-083801_Settings.jpg
    Screenshot_20211204-083801_Settings.jpg
    162 KB · Views: 24

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    I know that one brave person has downloaded this kernel.
    Any feedback?