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[GUIDE] Fix a bootloop on a rooted Zenfone 2

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Mael_RadecFR

Senior Member
Aug 6, 2015
112
27
Hello guys,
Here a easy way to fix a bootloop on your rooted Zenfone 2, if you make the error of apply an OTA while being rooted for example.
The only inconvenient of this method is that you will lost your internal data (like SMS, apps, downloads... But not your photos if they were in your SD Card). Another thing, you must have enabled the USB debugging before.
PS : I’m French sorry if my English is not perfect :D

Step 1
In your Zenfone 2, verify that you can go in fastboot mode : power off your Zenfone. Then, press the Power-On button until the phones vibrates twice. Release it, then go press the Volume+ button until this screen appears :
SAM_0621.jpg
If that works, connect your Zenfone to your PC.

Step 2
Now go in Asus Website for download the most recent stock ROM of your Zenfone 2 (size : around 1.1 Go) :
ZE551ML : https://www.asus.com/fr/Phones/ZenFone_2_ZE551ML/HelpDesk_Download/
ZE550ML : https://www.asus.com/fr/Phones/ZenFone_2_ZE550ML/HelpDesk_Download/
ZE550CL : http://www.asus.com/fr/Phones/ZenFone_2_ZE500CL/HelpDesk_Download/
Remove the SD Card of your phone and copy it the zip, you can do it after if your connection is slow.

Step 2.5
I’m not sure if this is mandatory but do it by prevention : install “15 Seconds ADB Installer” : here a guide for intall it :
http://forum.xda-developers.com/showthread.php?t=2588979

Step 3
When this is done, download the folder named : “CWM_Zenfone_2_Intel.zip” :
https://www.mediafire.com/folder/w70w7r1a65840/Zenfone_2
Extract the files, then open the folder :
CAI.png

Step 4
Run “cai_dat_CWM.bat
Type “ACCEPT” in the command window, in capitals, then press Enter.
accept.png
Then, if your Zenfone 2 is connect to your PC in fastboot mode and if the script is blue, that’s perfect ! ;)
t4.png
Type “T4”, press Enter, and normally something like this will happen in your Zenfone 2 :
_AM_0622.jpg

Step 5
Shortly after, your Zenfone will reboot in CWM Recovery Mode
SAM_0624.jpg

With the buttons, go in :
Install zip > choose zip from external sd card > *name of the stock ROM* > Yes, install
When the installation is done, reboot your device, and normally the bootloop will be fixed ! CONGRATULATIONS :good: :victory:
 

chetank08

New member
Nov 11, 2015
4
0
i tried to wiped cache in recovery mode but before it completes i restarted the phone
so now when i start my phone it just blinks error bot and even when i select recovery mode same thing happens
i also tried to solve it with ADB method but it do not detect my phone
PLZ HEPL ASAP!
 

88lochi

Member
Jun 3, 2012
11
0
Worked! Thanks!

Thank you so much! :good:
It worked for me. Although I had to clear cache and dalvik cache before installing the zip, otherwise my phone would reboot into fastboot when trying to flash the zip.
And best of all: I didn't loose any data!! Just had to root again using method 3 and install busybox. :D
I edited my build.prop because on the Amazon App Store there is an app (Navigon Europe) that can't be installed because Amazon says my device would be incompatible which it isn't because the Play Store says it's fine. Anyway, upon rebooting I was stuck at the splash screen. Luckily I was still able to get into fastboot...

Thanks again!
 

pozum

New member
Jun 13, 2015
4
1
Still doesnt boot up

Hi! Thank you for your guide! I ran into a bit of a problem, maybe you will be able to help me out.
I by mistake did an OTA update while rooted, and my phone is now stuck on ASUS logo. I tried to flash different roms from external SD card, but even though they install correctly, phone still does not boot....
Fastboot gives me "permission" problem, ADB says device not found....
Any help would be greatly appreciated, because I am about to give up and go buy another phone.
Thanks a lot in advance
 

ElmirBuljubasic

Senior Member
Feb 9, 2012
1,899
406
Hi! Thank you for your guide! I ran into a bit of a problem, maybe you will be able to help me out.
I by mistake did an OTA update while rooted, and my phone is now stuck on ASUS logo. I tried to flash different roms from external SD card, but even though they install correctly, phone still does not boot....
Fastboot gives me "permission" problem, ADB says device not found....
Any help would be greatly appreciated, because I am about to give up and go buy another phone.
Thanks a lot in advance

Tried other usb ports and cables? do you have all necessary drivers?
 

kford87

New member
Jan 1, 2016
4
0
Same problem

I'm having the exact same issue as Pozum. ADB won't detect device. It won't boot. Is it completely bricked or can I do something?
 

shaananis58

Member
Jan 8, 2016
21
1
Help

hello ...i recently rooted rooted my zenfone 2 and deleted the bloatware . I have and app call kingroot which i used to uninstall those apps ... this app also has a thing called Purify . i used it and it told me to restart and so i did . now the phone is stuck in bootloop . This is the 1st time I've restarted after rooting . Will your process work on mine ? Thanks in advance
 

MikeyLee

Senior Member
Jul 20, 2010
3,968
632
Phoenix
Hello guys,
Here a easy way to fix a bootloop on your rooted Zenfone 2, if you make the error of apply an OTA while being rooted for example.
The only inconvenient of this method is that you will lost your internal data (like SMS, apps, downloads... But not your photos if they were in your SD Card). Another thing, you must have enabled the USB debugging before.
PS : I’m French sorry if my English is not perfect :D

Step 1
In your Zenfone 2, verify that you can go in fastboot mode : power off your Zenfone. Then, press the Power-On button until the phones vibrates twice. Release it, then go press the Volume+ button until this screen appears :
View attachment 3458839
If that works, connect your Zenfone to your PC.

Step 2
Now go in Asus Website for download the most recent stock ROM of your Zenfone 2 (size : around 1.1 Go) :
ZE551ML : https://www.asus.com/fr/Phones/ZenFone_2_ZE551ML/HelpDesk_Download/
ZE550ML : https://www.asus.com/fr/Phones/ZenFone_2_ZE550ML/HelpDesk_Download/
ZE550CL : http://www.asus.com/fr/Phones/ZenFone_2_ZE500CL/HelpDesk_Download/
Remove the SD Card of your phone and copy it the zip, you can do it after if your connection is slow.

Step 2.5
I’m not sure if this is mandatory but do it by prevention : install “15 Seconds ADB Installer” : here a guide for intall it :
http://forum.xda-developers.com/showthread.php?t=2588979

Step 3
When this is done, download the folder named : “CWM_Zenfone_2_Intel.zip” :
https://www.mediafire.com/folder/w70w7r1a65840/Zenfone_2
Extract the files, then open the folder :
View attachment 3458828

Step 4
Run “cai_dat_CWM.bat
Type “ACCEPT” in the command window, in capitals, then press Enter.
View attachment 3458829
Then, if your Zenfone 2 is connect to your PC in fastboot mode and if the script is blue, that’s perfect ! ;)
View attachment 3458830
Type “T4”, press Enter, and normally something like this will happen in your Zenfone 2 :
View attachment 3458840

Step 5
Shortly after, your Zenfone will reboot in CWM Recovery Mode
View attachment 3458841

With the buttons, go in :
Install zip > choose zip from external sd card > *name of the stock ROM* > Yes, install
When the installation is done, reboot your device, and normally the bootloop will be fixed ! CONGRATULATIONS :good: :victory:

Why in the **** did you link the french site to this?
 

temenalie

Senior Member
Mar 20, 2011
1,018
454
Banjarmasin, Kal-Sel
Hello buddy,

I really need your help. I rooted my Asus with your method. But at that time you had not post CWM Recovery. Unfortunately, my nephew play with my Asus then he touch update OTA. Finally My device being stuck on Asus logo, while it doesn't have CWM Recovery.

Could you please give guidance

I brought you here, check on first post, hope it help. Good luck
 

Spoder Mun

New member
Mar 13, 2016
1
0
Hi there, hope there's a chance of a reply !

So I've got the blinking Android robot with red explanation mark! and I'd just like to know how long it takes for the phone to reload after installation?

Its stuck on the Asus boot up screen with the loading symbol under it !
 
Last edited:

Clavin0089

Member
Mar 16, 2016
7
1
I did the same thng.

i tried to wiped cache in recovery mode but before it completes i restarted the phone
so now when i start my phone it just blinks error bot and even when i select recovery mode same thing happens
i also tried to solve it with ADB method but it do not detect my phone
PLZ HEPL ASAP!

Hello. I believe I did the same exact thing :(. Did you by chance ever get back into Recover y mode or get the PC to recognize your phone. I'm a total novice with this, and very lost. Thank you.
 

ericvet

New member
Mar 17, 2016
4
1
i was hope ... but

Hi! there.

i spend last to days literelly trying to fix my zf2 ZE551ml, it gets frozen when i wipe cache so i force power off... what a mistake.


i was trying to fix it, and i got it worst. i think i erase recovery menu, so i can't adb sideload, fastboot saids that can not load image system.img, asus flash tool said "flash image failure (failed with error #1), xFSTK works to bring fastboot menu, but since i don't have the file to put on OS dns space, it didn't work, but, after hours and hours, in my last try of a long nigth, i did this guide.


when i see a cwm icon, i can't believe it!! almost made my entire two days, but suddenly, it was all sad, when i tried to install from external sd card it says that there is an error. And the problem still there. here is an option to install zip by sideload, but in de pc said not device detectec.


i really don't know what to do, i'm really tired, and my options are getting over...

any ideas??

Thank you all!!
 

Clavin0089

Member
Mar 16, 2016
7
1

Thank you for suggesting this guide! It did help me to get back into the recovery mode, however, after following the steps within the guide very diligently. I am still unable to get past the initial loading screen. :(. I received the permissions denied error just as the post suggested I would. I wiped the cache partition at the end of following the steps as suggested. Still. It will not load to the Welcome screen :(.
 

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  • 9
    Hello guys,
    Here a easy way to fix a bootloop on your rooted Zenfone 2, if you make the error of apply an OTA while being rooted for example.
    The only inconvenient of this method is that you will lost your internal data (like SMS, apps, downloads... But not your photos if they were in your SD Card). Another thing, you must have enabled the USB debugging before.
    PS : I’m French sorry if my English is not perfect :D

    Step 1
    In your Zenfone 2, verify that you can go in fastboot mode : power off your Zenfone. Then, press the Power-On button until the phones vibrates twice. Release it, then go press the Volume+ button until this screen appears :
    SAM_0621.jpg
    If that works, connect your Zenfone to your PC.

    Step 2
    Now go in Asus Website for download the most recent stock ROM of your Zenfone 2 (size : around 1.1 Go) :
    ZE551ML : https://www.asus.com/fr/Phones/ZenFone_2_ZE551ML/HelpDesk_Download/
    ZE550ML : https://www.asus.com/fr/Phones/ZenFone_2_ZE550ML/HelpDesk_Download/
    ZE550CL : http://www.asus.com/fr/Phones/ZenFone_2_ZE500CL/HelpDesk_Download/
    Remove the SD Card of your phone and copy it the zip, you can do it after if your connection is slow.

    Step 2.5
    I’m not sure if this is mandatory but do it by prevention : install “15 Seconds ADB Installer” : here a guide for intall it :
    http://forum.xda-developers.com/showthread.php?t=2588979

    Step 3
    When this is done, download the folder named : “CWM_Zenfone_2_Intel.zip” :
    https://www.mediafire.com/folder/w70w7r1a65840/Zenfone_2
    Extract the files, then open the folder :
    CAI.png

    Step 4
    Run “cai_dat_CWM.bat
    Type “ACCEPT” in the command window, in capitals, then press Enter.
    accept.png
    Then, if your Zenfone 2 is connect to your PC in fastboot mode and if the script is blue, that’s perfect ! ;)
    t4.png
    Type “T4”, press Enter, and normally something like this will happen in your Zenfone 2 :
    _AM_0622.jpg

    Step 5
    Shortly after, your Zenfone will reboot in CWM Recovery Mode
    SAM_0624.jpg

    With the buttons, go in :
    Install zip > choose zip from external sd card > *name of the stock ROM* > Yes, install
    When the installation is done, reboot your device, and normally the bootloop will be fixed ! CONGRATULATIONS :good: :victory:
    1
    My fone is Z008 but I get a error message: This package for Z008 devices. THis is a Z00A???