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[Read] [System] HOW TO FIX BOOTLOOP AFTER UPDATE / FLASH YOUR DEVICE WITH PRE-ROOTED FIRMWARE.

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ZenFone2 Bug Report
Model: -
RAM: 4G
Firmware/APP Version: 2.20.40.90
Frequency of Occurrence: 2.3Ghz
Rooted: No
APP Name: -
Screenshot: -
Last edited by aboutmarkanthony on 2015/9/14 19:42

WORKAROUND FOR BOOTLOOP DEVICES AFTER UPDATE.

*PICTURES TO FOLLOW*

RE: "Tutorial for flashing PRE-ROOTED stock system.img. on rooted devices with error OTA or MANUAL update."
REASON: Devices (Zenfone 2) with bootloop, and error when trying to update via OTA (Over-the-Air),
or Manual update (MOFD_SDUPDATE.zip) because of previous ROOTING PROCESS and other system modifications.

TRIED AND TESTED.
****
THINGS TO REMEMBER:
Z008 = ZE550ML
Z00A = ZE551ML (2GB/4GB RAM)
Please download correct firmware for your device.

FILES NEEDED:
1. Drivers for Asus Zenfone 2, Installed on PC.
2. ADB Installed on your PC. (latest version is 1.4.2)https://drive.google.com/…/0B0MKgCbUM0itVVFWRC02Q0VBQnc/view
3. Flash Tools http://forum.xda-developers.com/attachment.php…
4. Pre-rooted system.img and recovery. (Please download correct firmware which is present in your phone)
https://mega.co.nz/#F!k4MHiAgL!dVuOKeH3eokcwPSNI79ffw

LET'S START!
1. Install the adb (version 1.4.2) in your PC.
2. Extract Flash Tools.
3. "system.img" is extracted from Z00X_XX_X.XX.XX.XX_system_w_root.zip parts.
Divided into 6 parts:

Z00X_XX_X.XX.XX.XX_system_w_root.z01
Z00X_XX_X.XX.XX.XX_system_w_root.z02
Z00X_XX_X.XX.XX.XX_system_w_root.z03
Z00X_XX_X.XX.XX.XX_system_w_root.z04
Z00X_XX_X.XX.XX.XX_system_w_root.z05
Z00X_XX_X.XX.XX.XX_system_w_root.zip

**(XX is firmware version, CLICK the Z00X_XX_X.XX.XX.XX_system_w_root.zip, and extract the main "system.img" to the folder.)

3A. Please extract all downloaded files in one folder.
Please make sure that your folder contains these following files.
adb.exe
AdbWinApi.dll
AdbWinUsbApi.dll
boot.img
droidboot.img
Enter_Bootloader.bat
fastboot.exe
md5sum
recovery.img
system.img

4. Connect your Device to your PC. Then boot in FASTBOOT MODE.
4A. To boot in fastboot mode, In power off, Hold Power + Volume UP, when your device vibrates, release the power button.
If you will see a Big Android (Relaxing or Sleeping), your'e doing it right.
5. Go back in the folder, then ANYWHERE hold SHIFT then click RIGHT CLICK, and choose "OPEN COMMAND WINDOW HERE".
6. Enter this following fastboot command. Wait for the process to complete before copying and entering the next line command.

6A. fastboot flash fastboot droidboot.img
WAIT.. blah.. blah.. blah..
6B. fastboot flash recovery recovery.img
WAIT.. blah.. blah.. blah..
6C. fastboot flash boot boot.img
WAIT.. blah.. blah.. blah..
6D. fastboot flash system system.img
WAIT.. blah.. blah.. blah..

IF THE SYSTEM.IMG gets error, you installed wrong adb version.
REMINDER: The flashing of "system.img" will take huge time to process, DO NOT TURN OFF OR RESTART YOUR DEVICE, wait for the word "FINISHED".
7. After, it will show finished, then you can plug out the USB and press the power button, reboot your phone and when it starts up, your phone is ROOTED.
8. After successful boot, GO DIRECTLY to SUPERSU application, then click SETTINGS, and search for "FULL UNROOT", after that reboot your phone.

9. YOUR PHONE IS NOW READY FOR OTA OR MANUAL UPDATE.
OTA or Over-the-AIr update :
Click Settings > About > System Update > Check Update
Manual Update :
Download your needed Manual firmware version here:
9A. Rename the FIRMWARE zip you download to "MOFD_SDUDATE.zip" then copy it in your micro SDcard.
9B. Boot your device into FASTBOOT mode. (If you will see a Big Android (Relaxing or Sleeping), your'e doing it right.)
9C. Press VOLUME DOWN, until you will reach RECOVERY MODE.
click, POWER BUTTON, then it will update your device.
10. ENJOY!
********
TRIED AND TESTED PROCEDURE.
Feel free to ask questions. Follow the instructions carefully, Please comment below.
I can't answer PM for inquiries everytime. And for sure, Admins will also be there for everyone who needs help. Thank you!. smile emoticon

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PHL Level 1 | All posts
hello po. magwowork po ba to sa di nakaroot o kailangan nakaroot? kasi ganun sa akin (error while installing system update). ZE551ML 4/64 yung sa akin.
Props
@tricktuazon : Yes, after installing this flash, magiging root ang system mo kase pre-rooted ang system.img neto, to unroot your device, you can simply full unroot using FULL UNROOT ng SUPERSU.
Props
PHL Level 1 | All posts
ayun nagwork. salamat sa TUT sir!
Props
Welcome and no problem sir!
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IDN Level 1 | All posts
thankssss A lottt aboutmarkanthony
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IND Level 1 | All posts
i succeeded in cmd process but yet its still stuck in bootloop
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PHL Level 1 | All posts
Last edited by carlos005 on 2015/11/15 22:02

Last time I updated my phone to latest firmware. (Yes, my phone's not rooted) Some say that clearing cache partition can eliminate the remnants of previous update and helps new update to work smoothly.
During the process my phone turned off (due to low battery), interrupting the entire process. And when I tried to open it, it is now in a boot-loop. Can this method be used without deletinmy files? Please help. Thanks for helping.
Props
Yes. You can try this process sir.
Props
PHL Beta Tester | All posts
Hi aboutmarkanthony,

Tinry ko yung above procedures but nag stuck ako sa USB logo na screen. Anung solution mu dun bro?

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