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[Tips] How to Downgrade ASUS Zenfone 2 ZE551ML/ZE550ML

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iyon_srgn IDN Dr.Zen | All posts
Last edited by iyon_srgn on 2018/1/13 21:42

How to Downgrade ASUS Zenfone 2 ZE551ML/ZE550ML

Please do it carefully and DWYOR (Do it with your own risk) because wrong move may cause the device brick.

Resources:

1. ADB Fastboot Installer (Download Here if you don't have it)
2. ZenFone 2 Original Recovery.img, bootloader.img, boot.img (ZE551ML | ZE550ML)
3. ZenFone Firmware (ZE551ML | ZE550ML) select OS Android and download your firmware

How to Downgrade ASUS Zenfone 2 :

  • In this tutorial I will downgrade from WW_2.20.40.203  to WW_2.20.40.156
  • Download ADB and Install it
  • Download Recovery.img, bootloader.img, boot.img
  • Download Firmware (lower version than your current version) -> I download WW_2.20.40.156 version
  • Place Recovery.img, bootloader.img, boot.img to Downgrade Folder
  • Go to Fastboot Mode (Turn off device and press power+volume up) or conncet the device to pc/laptop at downgrade folder press shift+right click -> open command here and type adb reboot bootloader (need usb debugging activated)
  • Connect your Zenfone 2 to PC/Laptop
  • Type on CMD (press enter after each line):


fastboot flash fastboot droidboot.img
fastboot flash recovery recovery.img
fastboot flash boot boot.img

  • Enter recovery (Tutorial Here)
  • Select Apply update from adb
  • Open ZE551ML/ZE550ML firmware folder and press shift+right click > open command here
  • Connect your Zenfone 2 to PC/Laptop
  • Type on CMD (press enter after each line): adb sideload UL-Z00A-WW-2.20.40.156-user.zip
  • Factory Reset (To avoid a crash error, but not perform factory reset is ok)
  • Done




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Please update my new update my Asus mobile phone
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Volte not supported volte update
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iyon_srgn IDN Dr.Zen | All posts
manibhai801499765 posted on 2018/1/17 15:28
Please update my new update my Asus mobile phone

what type of zenfone and your android version?
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ZWE Level 1 | All posts
Question guys, are thre clone Zenphone Zoom phones out thre?
I hv Zoom ZX551, bt I mine is not behaving like it shuld..
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 how to update manually ZenFone 2 ze551ml android 6.0.1 update in android 7
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