[GUIDE] Changing p2c72 to p2a42 and flashing custom ROMs

[olivermt]

I doubt about a triangle with exclamation mark and red circle.
It comes out in the upper left where the coverage, battery level, ... I don't know it is removed.
Please help.


Enviado desde mi Lenovo P2a42 mediante Tapatalk

 

[b50corei5]

All of the ROMs have worked so far for me

 

[kalmas77]

I can't install any ROM. I have bootloader unlock and TWRP installed, but any ROM i installed doesn't boot. Any advice?

 

[mouwen]

I'm sorry Lodd, but the stock ROM file you provided was wrong.
WRONG file: http://www.mediafire.com/file/mm9b6hlwbaxpdnj/P2a42_S048_161111_ROW_fastboot_Lodd.7z

This is the REAL one to change p2c72 to p2a42:
https://mega.nz/#!3hhhhRYC!bDbs1VGHA7s0n-uH-B30fVDsulFRVw-ZbYTvheS9m8I
I've tried it myself and I can confirm it's 100% working.

Steps:
1. Install minimal ADB tool: https://forum.xda-developers.com/showthread.php?t=2588979
2. Go to "Settings -> About Phone -> Build Number", press it several times to enable Developer Mode
3. In Developer Mode, enable USB Debugging
4. Install "Lenovo USB driver.exe" (Included in the stock ROM file above)
5. Connect Lenovo P2 to your computer with USB cable, allow USB debugging
6. Open command prompt, type "cd C:\adb", press ENTER
7. Then type "adb reboot recovery", press ENTER
8. Phone will reboot and enter recovery mode
9. Run "flashall.bat" in the SW folder of the stock ROM files, wait until it finishes and reboots
10. Now your phone has become p2a42!

---------- Post added at 05:31 PM ---------- Previous post was at 05:26 PM ----------

I can't install any ROM. I have bootloader unlock and TWRP installed, but any ROM i installed doesn't boot. Any advice?

In TWRP, you need to change the file system format to ext4.
You will lose all data, so make a backup before changing it.

 

[kalmas77]

In TWRP, you need to change the file system format to ext4.
You will lose all data, so make a backup before changing it.

Doesn't work Normally most ROM's are not finished installing always stuck in patching system image unconditionally.
LineageOS 14.1 it was installed but the screen was black with the blue LED on. I have the S251 version

 

[tr4usut2]

I'm sorry Lodd, but the stock ROM file you provided was wrong.
WRONG file: http://www.mediafire.com/file/mm9b6hlwbaxpdnj/P2a42_S048_161111_ROW_fastboot_Lodd.7z

This is the REAL one to change p2c72 to p2a42:
https://mega.nz/#!3hhhhRYC!bDbs1VGHA7s0n-uH-B30fVDsulFRVw-ZbYTvheS9m8I
I've tried it myself and I can confirm it's 100% working.

Steps:
1. Install minimal ADB tool: https://forum.xda-developers.com/showthread.php?t=2588979
2. Go to "Settings -> About Phone -> Build Number", press it several times to enable Developer Mode
3. In Developer Mode, enable USB Debugging
4. Install "Lenovo USB driver.exe" (Included in the stock ROM file above)
5. Connect Lenovo P2 to your computer with USB cable, allow USB debugging
6. Open command prompt, type "cd C:\adb", press ENTER
7. Then type "adb reboot recovery", press ENTER
8. Phone will reboot and enter recovery mode
9. Run "flashall.bat" in the SW folder of the stock ROM files, wait until it finishes and reboots
10. Now your phone has become p2a42!

---------- Post added at 05:31 PM ---------- Previous post was at 05:26 PM ----------


In TWRP, you need to change the file system format to ext4.
You will lose all data, so make a backup before changing it.

I HAVE NOT boot loader unlocked. Should i change to p2a42 by your method, will it boot loop? And can i solve myself if it bootloop. Thanks you

 

[mouwen]

I HAVE NOT boot loader unlocked. Should i change to p2a42 by your method, will it boot loop? And can i solve myself if it bootloop. Thanks you

No problem with that. You don't have to unlock the boot loader.

 

[tr4usut]

I'm sorry Lodd, but the stock ROM file you provided was wrong.
WRONG file: http://www.mediafire.com/file/mm9b6hlwbaxpdnj/P2a42_S048_161111_ROW_fastboot_Lodd.7z

This is the REAL one to change p2c72 to p2a42:
https://mega.nz/#!3hhhhRYC!bDbs1VGHA7s0n-uH-B30fVDsulFRVw-ZbYTvheS9m8I
I've tried it myself and I can confirm it's 100% working.

Steps:
1. Install minimal ADB tool: https://forum.xda-developers.com/showthread.php?t=2588979
2. Go to "Settings -> About Phone -> Build Number", press it several times to enable Developer Mode
3. In Developer Mode, enable USB Debugging
4. Install "Lenovo USB driver.exe" (Included in the stock ROM file above)
5. Connect Lenovo P2 to your computer with USB cable, allow USB debugging
6. Open command prompt, type "cd C:\adb", press ENTER
7. Then type "adb reboot recovery", press ENTER
8. Phone will reboot and enter recovery mode
9. Run "flashall.bat" in the SW folder of the stock ROM files, wait until it finishes and reboots
10. Now your phone has become p2a42!

---------- Post added at 05:31 PM ---------- Previous post was at 05:26 PM ----------


In TWRP, you need to change the file system format to ext4.
You will lose all data, so make a backup before changing it.

Hey @mouwen , step 7 should adb reboot bootloader. Your method work like a charm. thanks you very much

 

[rogat92]

This is the REAL one to change p2c72 to p2a42:
https://mega.nz/#!3hhhhRYC!bDbs1VGHA7s0n-uH-B30fVDsulFRVw-ZbYTvheS9m8I
I've tried it myself and I can confirm it's 100% working.

Hi mate, colud you reupload that file pls??

 

[mouwen]

Hi mate, colud you reupload that file pls??

I uploaded it again here:
https://drive.google.com/file/d/1nz9pyV0W6LwzYgIpP68m5OruE-ndZgCh/view?usp=sharing

Let me know if not working.

 

[myjess]

An old thread I know, but what exactly causes the bootloop after installing a custom rom on a p2c72?
I followed the below and my P2c72 boots into the AOSP Pie rom, but when magisk is installed and modifies boot, the next reboot hangs with a blue/white led and no screen.

Fot anyone still remotely interested, here is how to get P2C72 booted with custom roms.
Translated From Russian into English from:
https://4pda.ru/forum/index.php?act...posts&sort=rel&subforums=0&query=p2c72&topics[]=801117&forums=583&st=20

aleksgrayvoron @ 21.11.17, 21:30 *
As far as I understood from the experiments with backups, TWRP does not restore the boot. At least on P2c72. Therefore, I do not back it up. When I try to restore, the vibration and the blue diode.

In such a case when the blue diode, then you need to flash the native factory boot through the TV and rut it again, then the system starts without a blue diode.
100% Tvrpshniki missed something, exactly this picture was observed on the euro version 4/32

Post has been editedYura911 - 24.11.17, 00:48

 

[slovantes]

Does P2c72 with P2a42 firmware have any connectivity issues with custom roms like LineageOS ? Or is it basically the same to P2a42 ?

If the P2c72 already came with P2a42 firmware installed (in my case, the phone build number is P2a42_S251_171107_ROW) that means we don't have to do anything, just treat it as the P2a42, and install P2a42 twrp, rom, etc. right ?

The problem is, the LenovoID is not approved (trying to unlock bootloader), "network connectivity failed", although i'm connected to the internet.