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JohnnyBegooD FRA Level 2 | All posts
Last edited by JohnnyBegooD on 2015/7/14 14:15

Guide only for WW ZE550ML / WW ZE551ML


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]


How to Enter "Recovery Mode" on Asus Zenfone 2

  • Turn Off your Zenfone 2
  • Hold Power button + Volume up
  • When the phone is vibrating release the Power button
  • Then the Display change like this


  • You can select "Normal Boot" or "Recovery Mode" by pressing Volume Up/Down, to enter Recovery choose "Recovery Mode"


  • Then you will see sleep Android Robot, Press Power button and Volume up, after one second release the Volume up


  • You will see Asus Zenfone 2 Recovery Mode

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USA Beta Tester | All posts
+1 for this guide, this will solve some of our members problem. Keep up the good work.
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MYS Beta Tester | All posts
Which one better bro WW_2.15.40.10 or WW_2.15.40.13 ?
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JohnnyBegooD FRA Level 2 | All posts
t5unami posted on 2015/6/7 13:43
Which one better bro WW_2.15.40.10 or WW_2.15.40.13 ?

For the battery, the 2.15.40.10 is better.

With this version, yu can have  ~12days standbuy

Sorry for my english
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MYS Beta Tester | All posts
Last edited by t5unami on 2015/6/8 13:01
JohnnyBegooD posted on 2015/6/7 17:45
For the battery, the 2.15.40.10 is better.

With this version, yu can have  ~12days standbuy

late reply.... already dgrade to WW_2.15.40.13BUT thank a lots bro
one more thing bro....what actually serious bugs on 2.15.40.10 if compare to 2.18.40.12 either than battery life issue
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JohnnyBegooD FRA Level 2 | All posts
t5unami posted on 2015/6/8 12:19
late reply.... already dgrade to WW_2.15.40.13BUT thank a lots bro
one more thing bro ...

I wait 5.1 android version ...
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PHL Beta Tester | All posts
Can you screenshot ur battery meter after downgrading to 2.15.40.10  Pleaseeee   I need to see the percent of Android OS screen etc.
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JohnnyBegooD FRA Level 2 | All posts
Last edited by JohnnyBegooD on 2015/6/9 20:23
caren15delacruz posted on 2015/6/9 19:20
Can you screenshot ur battery meter after downgrading to 2.15.40.10  Pleaseeee   I need to see the ...

Ok, give me 24 hours for the screen.

here is one of my tests on 2.15.40.13:
*Standby (with any apps in background): 15Hours = 06%
*YoutubeMovie+Wifi+LightScreen100%+2G: 01Hour = 14%
*Call2G: 01Hour = 03%
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USA Level 1 | All posts
I bricked my ZE550ML, and I can't connect with ADB.  I can get into recovery and fastboot works, but I can't sideload the firmware.  Any suggestions?
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JohnnyBegooD FRA Level 2 | All posts
Last edited by JohnnyBegooD on 2015/6/9 22:43
ConnCarl posted on 2015/6/9 22:11
I bricked my ZE550ML, and I can't connect with ADB.  I can get into recovery and fastboot works, but ...
How have yu brick your smartphone?

Try > In the boot loader, use cmd: fastboot flash recovery recovery.img
                                             fastboot flash boot boot.img
                                             fastboot flash fastboot droidboot.img

If it does not work, you need to make a repair request to after sale asus. It's free and really fast if is just software problem.
But if you have root your smartphone, i don't know for the warranty, maybe if you have lucky.
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