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[Android 12] [EXPERIMENTAL] [RE-UPLOADED] AOSP Android 12 for A21s

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grccorps

Member
Mar 1, 2012
47
61
Seoul
the last update 27-11-2021 changelog is not working the phone is restarting everytime can anyone help me to solve this problem, thanks
I just test-flashed the latest release to see whether there is a problem, but the ROM booted with no problem with the Flame Gapps installed. Please check whether you have installed the ROM correctly. If the error persists, please reply again. Thank you.
 
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ayman9321

Member
Sep 13, 2021
11
0
AT&T Captivate
LineageOS
I just test-flashed the latest release to see whether there is a problem, but the ROM booted with no problem with the Flame Gapps installed. Please check whether you have installed the ROM correctly. If the error persists, please reply again. Thank you.
can you send the link of flame gapps ,thanks
and i flashed the rom as you said ine main post of the rom but when i finished the flash and restating the phone it is still restatart and did not open the phone i will try again ,thanks
 

grccorps

Member
Mar 1, 2012
47
61
Seoul
not a problem my bro thanks for replying
Just to check, which Android version were you on when flashing the ROM, 10 or 11? You must update to 11 before installing this ROM, as flashing this on top of Android 10 will cause bootloops.
Also, if you need to update to 11, I suggest you don't go beyond the version with U5 binary, as anything beyond that will permanently prevent downgrade to 10
 
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ayman9321

Member
Sep 13, 2021
11
0
AT&T Captivate
LineageOS
Just to check, which Android version were you on when flashing the ROM, 10 or 11? You must update to 11 before installing this ROM, as flashing this on top of Android 10 will cause bootloops.
Also, if you need to update to 11, I suggest you don't go beyond the version with U5 binary, as anything beyond that will permanently prevent downgrade to 10
my phone now did not accept to flash any rom and did not read fastboot lineage recovery and did not accept to flash lineage 18.1 with adb i do not not what happened after the last update firmware Sm-A217F , EGY ,thanks
 

johnny95

Senior Member
Sep 2, 2013
103
39
Constitución
Hey! Thanks for this rom

I was trying to install it but I'm stuck at "waiting for any device" when attempting to flash boot.img, it seems my phone disconnects automatically when I enter fastboot in Lineage Recovery. What am I doing wrong?
 

Ganzl 29482

Member
Nov 12, 2021
13
1
This Android is fine although it lacks a little more optimization since before installing this version of Android 12 had Android 11 Lineage 18.1 and I was right and correcting the SD card that for example if I have my music on the SD cardPlayer does not recognize it
 

Slxg

New member
Oct 23, 2021
2
0
Hi, I have an issue with NCF, if I'm understanding well the post says that I can activate it with an app, somebody can tell me which is or if there is a way to activate NFC ? Thanks
 

kykkus

Member
Sep 5, 2012
9
1
Hi i try to flash this rom many times and everytime i stuck on warning screen and phone doesn't boot... can you give me a little help? Thanks
Warning Screen.jpeg
 
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johnny95

Senior Member
Sep 2, 2013
103
39
Constitución
I thought the same when I first flashed this ROM, but then I noticed that it doesn't have boot animation, so I just waited until it finally showed the welcome screen. It took about two minutes anyway. It is working very smoothly and faster than LOS18, at least in my case.
PS: I just hate the lack of an option to switch the navigation bar (I am used to having the back button on the right, and the recent apps one on the left, but now I can't change it)
 

ayman9321

Member
Sep 13, 2021
11
0
AT&T Captivate
LineageOS
I thought the same when I first flashed this ROM, but then I noticed that it doesn't have boot animation, so I just waited until it finally showed the welcome screen. It took about two minutes anyway. It is working very smoothly and faster than LOS18, at least in my case.
PS: I just hate the lack of an option to switch the navigation bar (I am used to having the back button on the right, and the recent apps one on the left, but now I can't change it)
no, in the custom rom or the original firmware you can change navagation bar and i used the back button on the left side but in the any firmware it is in the right side so i change it , thanks
 

Pubgū

Member
Oct 27, 2021
5
1
Bro any other one rom custom ROMs asking bro like havoc ,evolution x, corvus os we are all waiting for that ROMs
 

Pubgū

Member
Oct 27, 2021
5
1
Just to check, which Android version were you on when flashing the ROM, 10 or 11? You must update to 11 before installing this ROM, as flashing this on top of Android 10 will cause bootloops.
Also, if you need to update to 11, I suggest you don't go beyond the version with U5 binary, as anything beyond that will permanently prevent downgrade to 10
Bro we need corvus os rom or oc kernel for a21s please make for gamers bro🥰
 

nuxlight

Member
Mar 1, 2017
15
4
Just when I want to test the ROM, u7 is unavailable :cry: Is it possible to have the old link (Just for testing the)
I understand this recovery is the only method to have a fastboot working
 

johnny95

Senior Member
Sep 2, 2013
103
39
Constitución
How can I downgrade to Android 11 (lineageos 18 or similar roms) after using this rom? I am currently facing problems with fastboot whenever I try to flash a different rom to this one, and lineage recovery shows an error when I try to flash lineageos 18.
 

bernavaldiesel1

Senior Member
May 1, 2015
149
44
43
valencia
Hi i try to flash this rom many times and everytime i stuck on warning screen and phone doesn't boot... can you give me a little help? Thanks
hello the same thing happens to me, my device is an a21s (a217f / dsn). It has 3gb ram and 32gb of storage. Were you able to solve the problem?. the device is on Android 11 with a217fxxs7cul1,and i guess "s7" is binary 7.
 
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  • 1
    Hi i try to flash this rom many times and everytime i stuck on warning screen and phone doesn't boot... can you give me a little help? Thanks
    Warning Screen.jpeg
  • 3
    WARNING + DISCLAIMER:
    By installing this custom ROM, you are VOIDING your warranty. Also, installation of this ROM WILL TRIP KNOX PERMANENTLY, and render apps such as Samsung Health, Private Folder, (+ any apps that depend on KNOX) useless until you get the phone's motherboard replaced at the Samsung C/S center.
    Although this software is released in the hope that it will be useful, there is NO GUARANTEE that installing this will not cause any harm to your device. I TAKE NO RESPONSIBILITY FOR ANY BRICKED DEVICES, DAMAGED HARDWARE, OR ANY OTHER PROBLEMS CAUSED BY THIS ROM. You are using this ROM at YOUR OWN RISK. I strongly recommend that you DO NOT continue to the steps below UNLESS YOU FULLY UNDERSTAND WHAT YOU ARE DOING.
    While this ROM has been tested with South Korean variant of Galaxy A21s (SM-A217N, CSC changed from LUC->SKC), please keep in mind that it hasn't been tested on any other variant (such as A217F, A217M.)
    I would like to express special thanks to all the developers who contributed to the LineageOS port for Galaxy Tab S6 Lite + all the other developers who contributed to sepolicy & hardware parts for Samsung SLSI (Exynos) devices. Porting LineageOS to A21s would have been much harder without them.

    This is Android 12 ROM built from Google's AOSP sources released on October 4, 2021. The sources are based on the Lineage OS for A21s, with some modifications for Android 12.

    NOT WORKING:
    Samsung Proprietary Apps (Samsung Health, etc.)
    VoLTE & VoWifi (Due to Samsung's twisted & wicked IMS service)
    Auto Brightness (The phone doesn't have the sensors for it anyway)
    ExFAT-formatted SD Card & OTG (there are legal problems associated with it.)

    Working but buggy or not tested:
    Audio volume is smaller than usual (WIP)
    RIL starting up late on very rare occasions. If telephony doesn't work after reboot, please allow up to a minute.
    Cell broadcast (emergency messages) is working in South Korea, but not tested in other countries

    Working, but needs installation of additional apps:
    NFC, Screen Sharing, Wi-FI Direct works, but needs installation of additional apps to work
    Browser app is not installed by default. Installing Firefox or Chrome from Google Play is recommended
    GPS & Location services don't work when GApps are not installed.
    This ROM is not compatible with TWRP due to File-based encryption.
    The ROM is NOT ROOTED by default. In order to root it, install Magisk from official source.

    WORKING:
    Everything else not mentioned above

    p.s. ADVANTAGES WHEN COMPARED TO GSI Android 12:
    Based on official release, whereas GSI is based on Beta 5
    Working MTP
    Working NFC
    Working Cell Broadcast
    Fixed Fingerprint removal bug
    Camera works up to 48MP (GSI camera is fixed @ 12MP)
    Double-tap-to-wake is working
    Model number correctly matches with the actual device (shows SM-A217N instead of AOSP on ARM64)
    Updated kernel graphics driver to the latest from ARM

    1. BEFORE INSTALLING, make sure that you have UNLOCKED the bootloader of your device. This is a great guide that show how to do it. Also, the phone must be on the Stock ANDROID 11. If you are on binary U6/U7, please use the recovery tar for U6/U7.

    2. Download the Lineage Recovery, ROM, Google Apps, ADB, and Odin. Unzip ADB and Odin to somewhere appropriate. Save the ROM images to the folder where you unzip ADB/Fastboot

    - ROM: super.img. boot.img, dtbo.img, recovery(U5), recovery(U6), recovery(U7)
    - ADB and Fastboot
    - Odin
    - Kernel Source
    - Google Apps(Flame)

    WARNING: A BUG WHICH CAN POTENTIALLY LEAD TO BOOT LOOP ON U7 WAS FOUND. IF YOU ARE ON U7, PLEASE DO NOT FLASH THIS ROM UNTIL THIS IS FIXED.

    3. Enable USB Debugging on the device. Go to settings->About phone->Software information, and tap the build number several times until you see the notification that the devloper settings have been enabled. After enabling developer settings, go to settings->developer settings and check USB debugging.

    4. Open Command Prompt, and type "cd <the path where you saved ADB to>".

    5. On the phone, start holding down the Volume Up and Down keys. KEEP THE KEYS PRESSED UNTIL THE PHONE REBOOTS AFTER YOU TYPE THE COMMAND IN THE NEXT STEP.

    6. While holding the keys down. type in the command "adb reboot recovery" on the command line.

    7. After the phone reboots into download mode, press volume up to continue. Make sure that you see the "OEM LOCK: OFF" before continuing.

    8. Open Odin. After opening Odin, click on AP, and select the Lineage Recovery Tar file that you downloaded in the step 2. After that, click on Start.

    9. After a few seconds, if everything goes well, Odin should show "PASS" and the device should reboot into Lineage Recovery. After the device enters recovery, tap on Advanced->Enter fastboot. In some cases, touchscreen may be unresponsive or slow. If that happens, use Volume Keys to navigate and Power key to select. KEEP THE DEVICE CONNECTED TO THE COMPUTER.

    10. After choosing Enter fastboot, type the following lines in the Command Prompt and press enter:
    10-1. "fastboot flash boot boot.img" ---> this takes around 5~10 seconds.
    10-2. "fastboot flash dtbo dtbo.img" ---> this takes around 5~10 seconds.
    10-3. "fastboot flash super super.img" ---> this takes several minutes.

    11. After the steps above are complete, choose Enter recovery. After the phone enters recovery, choose Apply update->Apply from ADB

    12. After choosing Apply from ADB, type "adb sideload <the path where you saved Google apps to>" on the Command Prompt and press enter.

    13. After about 1-2 minutes, installation should be complete. Again, ADB might show "Failed to read command" errors. As long as the phone says that it was success, this is no problem. After installing, click on the "back" icon on the top of the phone.

    14. Choose Factory reset->Format data/factory reset, and reboot the device.

    15. If everything went well, the phone should reboot into Android 12 AOSP. Set up the device and Enjoy!

    Changelogs:
    2021-10-19: Initial Release (AOSP 12.0.0_r2)
    2021-10-21: Updated to AOSP 12.0.0_r3
    2021-11-03: Updated to AOSP 12.0.0_r13 & added U7 support
    2021-11-22: Fixed graphics issue, fixed battery issue (when battery level sometimes dropped by more than 2-3% on reboot), and fixed force crash when choosing Battery Manager in Settings
    2021-11-25: Updated to AOSP 12.0.0_r15, changed battery mechanism to make it more accurate
    2021-11-27: Kernel GPU driver update (R33P0 -> R34P0), LTE is now enabled by default
    2021-12-10: Updated to AOSP 12.0.0_r16, removed the annoying search box widget on the home screen
    2022-01-01: EGL graphics driver update to improve performance, minor bug fixes related to some apps.

    SCREENSHOTS:
    Screenshot_20211019-212712.png
    Screenshot_20211019-212725.png
    Screenshot_20211019-212738.png
    Screenshot_20211019-212819.png
    Screenshot_20211019-221549.png
    Screenshot_20220102-070616.png
    2
    Thread locked and download links removed due to lack of kernel sources. @grccorps please read your PM to get the thread reopened.

    Cheers,
    garylawwd - Forum Moderator
    1
    This is great!

    Do you working on this ROM for A21s, or you working on LineageOS 18 A11, paralel with this ROM?
    Yes. I am also working on Lineage 18. Actually, the source code for this ROM is based on the source code for the Lineage 18. (of course, along with some modifications)
    1
    i got this when type and enter "fastboot flash boot boot.img"


    C:\Users\nussa\Downloads\platform-tools>fastboot flash boot boot.img
    < waiting for any device >

    nothing showing in phone log
    1
    I'm really sorry, but it is not possible to adb sideload images.
    I am a bit sad because gaming time screen is flickering... Grrcorps pls check in your phone