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[System] ZenFone 2 ZE551ML/ZE550ML unbrick guide

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nikkojamesreducto PHL Moderator | All posts



Hi guys !!, today i will gave u the tutorial to:

- Downgrade Your Zenfone 2 Firmware Or Upgrade It
- How To Reflash Your Phone If You Had A Soft Brick (Boot Loop) At Your Zenfone 2

This is not ROOT! After handling, your warranty will still be valid

So Lets start ! Dont Be Affraid Because This Tutorial Will Help You So Much.



Things you will need:

  • Zenfone 2 Firmware:
                 ZE550ML > Asus.support
                 ZE551ML > Asus.support
( ZE550ML=Z008 / ZE551ML=Z00A )



How to?
  • Be sur to have 50% battery or more
  • Download Recovery.img and Firmware of the same version
Example: You want to install 2.15.40.10 [UL-Z00A-WW-2.15.40.10-user.zip] Version Of Firmware Then You Should Download 2.15.40.10 recovery.img. The Version Of Recovery Image And Frimware Must Be Same!
  • Install Usb Driver & Adb Driver
Say "Yes" every time for Adb Driver Setup
  • Copy 2.15.40.10 recovery image [recovery.img] and the firmware [UL-Z00A-XX-X.XX.XX.XX-user.zip] file to Adb folder > C:\adb\
  • Activate the usb debug on your Zenfone 2 > settings > about > software info > tap on the build number until the popup show that indicate you are aleadry a dev " back to setting again now u will find developer options , click on it > switch it on there is a slider on top of the window > scroll down and u will find usb debug > check the box > popup showed click ok.
  • Connect the phone to pc > the rsa thing will pop up check the always allow and press allow on your phone screen tick always allow if the computer is yours.
If you do not see the popup, On adb cmd type adb devices (now you can see the popup and press allow, if you type adb devices again you can see your device in adb window)
  • Open adb folder and Shift + right click > Open Command pomport Here (click on it)
  • On the adb cmd type adb reboot-bootloader
  • After you enter the fastboot/droid boot, on the adb cmd type fastboot flash recovery <Recovery Image File Name.img>
Example: fastboot flash recovery recovery.img
  • After the recovery flash complete go to "recovery menu" and select on it, after you enter recovery navigate and select "update from adb"
  • And type on adb cmd adb sideload <Firmware File.zip>
  • Wait the for the process to complete the phone (~25min), if you have an auto reboot, you need to enter in the "boot loader" and select again"Recovery Mode"
  • you can now select "wipe data/factory reset" (~5min)
  • when is finish select "wipe cache partition" (~1min)
  • and for the end select "reboot system now"
  • The Boot process Will be Little Longer After This Process PLease Be Patient (~5min)
  • Finish

*Note This Tutorial Can Be Applied To This Cases : [U Want To Upgrade Your Zenfone 2 Or Downgrade It, Your Phone Has Soft Bricked (Boot Loop) And You Want To Fix It By Yourself]

Originally shared by: JohnnyBegooD
Technical PR Specialist - Mobile
ASUS Technology Philippines, Inc.
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IND Level 1 | All posts
The google drive links are not working. Can anyone help. I just need the recovery.img
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USA Level 1 | All posts
"Activate the usb debug on your Zenfone 2 > settings > about > software info > tap on the build number until the popup show that indicate you are aleadry a dev " back to setting again now u will find developer options , click on it > switch it on there is a slider on top of the window > scroll down and u will find usb debug > check the box > popup showed click ok."

If the phone is bricked, how can you turn on this option? My phone only works on fastboot boot. If i try to boot in normal mode, restart and again the same...
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THA Level 1 | All posts
shah.sahil03 posted on 2016/7/20 23:04
The google drive links are not working. Can anyone help. I just need the recovery.img

Thank You ขอบคุณ
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CHL Level 1 | All posts
Last edited by absalon.diaz on 2018/9/6 18:43

Hola amigos, no me funcionan los enlaces de descarga. Porfa ayudaaaa.
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