[ZE620KL] How To Go Back To Stock Firmware

[emincangencer]

Be careful. If you do something wrong you may damage your phone. Doesn't work with Android 10 Firmware. You need to go back to Pie to be able to flash.
You need raw firmware. You may not find the latest version. I've found V16.0615.1903.92.
https://drive.google.com/uc?id=16sY03_C14qqqldYjyurH_hyTgYEASEau&export=download(This is from mtkdevelopers.com)
1- Download the zip file and extract it.
2- Go to Fastboot.
3- Run ze620kl_auto_flash_raw.bat from zip file you extracted.
4- It will take up to 5-7 minute and will reboot automaticly.
5- Then you can install latest update from https://www.asus.com/Phone/ZenFone-5-ZE620KL/HelpDesk_BIOS/.
If you want to re-lock bootloader follow these steps:
## First you have to install stock firmware of course.
1- Go to recovery(This is stock of course after installing stock firmware). Wipe cache then format data. When you enter reboot option press Volume Up for bootloader(try not to boot into system. If you boot you have to wipe cache and data again)
2-

fastboot oem reset-dev_info

and

fastboot oem force-reset

3- Then reboot. Now you are in stock firmware and locked bootloader. Your bootloader warning should be gone. Still you can't get ota updates because your Imei number blacklisted. You have to install updates from zip file you get from Asus's website.
For locking bootloader, credits to @lopestom

 

[Redmamba]

After downgrading I installed firmware UL-ASUS_X00QD-ASUS-15.0619.1810.73-1.1.26-user.zip but I can't update to android 9 pie, error 7 or 21, or from sd or from internal memory

 

[emincangencer]

After downgrading I installed firmware UL-ASUS_X00QD-ASUS-15.0619.1810.73-1.1.26-user.zip but I can't update to android 9 pie, error 7 or 21, or from sd or from internal memory

This is V16.0615.1903.92. So after flashing stock firmware you should update to newest versions. You are trying to flash oldest firmware v15.0619.1810.73-1.1.26. You can't do that. Flash the stock firmware again then update to V16.0615.1910.112. If V16.0615.1910.112 can't insalled because it's to new try V16.0615.1905.102 then V16.0615.1910.112.

 

[Redmamba]

This is V16.0615.1903.92. So after flashing stock firmware you should update to newest versions. You are trying to flash oldest firmware v15.0619.1810.73-1.1.26. You can't do that. Flash the stock firmware again then update to V16.0615.1910.112. If V16.0615.1910.112 can't insalled because it's to new try V16.0615.1905.102 then V16.0615.1910.112.

I solved with this firmware
WW_16.0615. 1912.115
Thanks

 

[GVhenrique]

I solved with this firmware
WW_16.0615. 1912.115
Thanks

Is your USB to file transfer working well in this firmware version?

 

[Redmamba]

Is your USB to file transfer working well in this firmware version?

Yes, Everything works.

 

[ermanek]

I am having problems at detecting my device in fastboot mode. It reports nothing with the command "fastboot devices" and keeps reporting <wanting devices>. Is it possible to be a cable problem? I wish to relock my bootloader in order to use Google pay.

 

[Deero]

Thank you!! I was able to fix my device after re-locking the bootloader with twrp. Very Helpful!!

 

[ermanek]

Can I do this if I have installed TWRP and Magisk?

 

[rollmaster25]

thank you so much

amazing guide man thank you for the image as well fixed my phone

 

[MrMRmiguelo]

Thanks for the guide, now i need make a root with android 9. Suggestions?

 

[Emzkts]

Update failed???

i am getting this error... need help

0
'.\ze620kl_flash_raw.exe' is not recognized as an internal or external command,
operable program or batch file.
'.\ze620kl_flash_raw.exe' is not recognized as an internal or external command,
operable program or batch file.
""""""""""""""""""
"UPDATE FAILED !!"
""""""""""""""""""
" "
Press any key to continue . . .

 

[emincangencer]

i am getting this error... need help

0
'.\ze620kl_flash_raw.exe' is not recognized as an internal or external command,
operable program or batch file.
'.\ze620kl_flash_raw.exe' is not recognized as an internal or external command,
operable program or batch file.
""""""""""""""""""
"UPDATE FAILED !!"
""""""""""""""""""
" "
Press any key to continue . . .

You need to be on android 9 firmware to flash this. Go back to it by flashing Q-P ......2002.120.zip. Then run this

 

[Gaabzrzi]

hello everyone, this procedure serves to re-lock the bootloader and remove the unlocked device warning, so it comes back from the factory?

 

[deathfalls]

PLEASE HELP! my phone os is corrupted, i have an error when i do this tutorial. please help

 

[klushyer]

need help

I have a small problem, I can't access the fastboot mode of my cell phone, when I hold the + vol and power, it goes to the "CSI Fastboot" mode, my cell phone has TWRP installed, I installed a rom on it, but it doesn't come out from "ZENFONE"

 

[Redmamba]

I have a small problem, I can't access the fastboot mode of my cell phone, when I hold the + vol and power, it goes to the "CSI Fastboot" mode, my cell phone has TWRP installed, I installed a rom on it, but it doesn't come out from "ZENFONE"

Go to twrp and boot into bootloader

 

[GiacomoPasc]

Can't flash the raw image

hello. I have a problem. I can't flash the Raw image in Fastboot because I get this error.
0
'.\ze620kl_flash_raw.exe' is not recognized as an internal or external command,
operable program or batch file.
'.\ze620kl_flash_raw.exe' is not recognized as an internal or external command,
operable program or batch file.
""""""""""""""""""
"UPDATE FAILED !!"
""""""""""""""""""
" "
Press any key to continue . . .

I tried to flash on the system partition "Q-P ......2002.120.zip" but It doesn't change anything.
Can you help me? Thanks...

 

[Redmamba]

hello. I have a problem. I can't flash the Raw image in Fastboot because I get this error.
0
'.\ze620kl_flash_raw.exe' is not recognized as an internal or external command,
operable program or batch file.
'.\ze620kl_flash_raw.exe' is not recognized as an internal or external command,
operable program or batch file.
""""""""""""""""""


"UPDATE FAILED !!"
""""""""""""""""""
" "
Press any key to continue . . .

I tried to flash on the system partition "Q-P ......2002.120.zip" but It doesn't change anything.
Can you help me? Thanks...

Are you in android 9? If you extract the zipped raw file connect the mobile phone the bootloader to the PC recognize the mobile phone and click on the .bat file

 

[GiacomoPasc]

Are you in android 9? If you extract the zipped raw file connect the mobile phone the bootloader to the PC recognize the mobile phone and click on the .bat file

I don't know If I am in Android 9,because I flashed the zip Update of Android 10 in TWRP and later I flashed the Evolution X rom(stuck on boot animation).
After rebooting the phone I was not able to access the recovery (It rebooted in Fastboot).
Now After trying many times, the recovery Is not accessible and when the mobile phone tries to boot it reboots in Fastboot Mode.