[ZenFone 2 General] ansebovi:
hi guys,there are so much confusion on OTA updates over rooted device

and yes i screwed my device by removing bloatwares and end up in bootloop,so here what i did to recover and update the OTA..

if u didnt remove bloatware or didnt edit the system apps[freezing is no problem] then you can just unroot using supersu and reboot once,click update but if u removed bloatware or ended up in bootloop,follow below steps

I'm not responsible for bricked phone,try on your own risk

Credit goes to: [Mention=5650813] mhp1995[/Mention] for his all in one thread and clear instructions, [MENTION=1813976]shakalaca[/MENTION] , [MENTION=4723868]keepfishes[/MENTION],i didnt do anything ,i just made their links,guide at one place..

First things first: (get this straight, don't download the wrong firmware and flash the wrong thing)

ZE550ML = Z008

ZE551ML[2gb,4gb ram] = Z00A

What this guide giving steps for:[just more like summary]

Files Needed and Required before Steps: - Just basic drivers to activate adb,fastboot

Steps To recover from Bootloop: - flashing system,kernel,recovery,droid boot to fix the phone[flashing system alone is mostly enough]

Steps to Apply OTA manually: - getting ota zip and put it in sd by renaming then goto recovery,flash

Files Needed and Required before Steps:

Drivers for Asus Zenfone 2 installed on PC from here [mostly it will auto installed]

ADB installed on your PC (https://drive.google.com/file/d/0B0MKgCbUM0itVVFWRC02Q0VBQnc/view?usp=sharing)

Flashtools[http://xdaforums.com/attachment.php?attachmentid=3301263&d=1431011927]

WinRar

Steps To recover from Bootloop:

three methods are there,using preroot img, using adb sideload and using stock.zip given by asus[if u think flashing,adb sideload is hard,use stock.zip method]

Pre Root Stock using flashtools:

Pre-rooted system.img and recovery (https://mega.co.nz/#F!k4MHiAgL!dVuOKeH3eokcwPSNI79ffw) (Download the correct firmware according to your phone ZE550ML = Z008 , ZE551ML = Z00A )

Download and run WinRAR . Click on the '.zip' part of the system.img file. You will see that WinRAR puts all the parts together and offers you an option to extract the one big system.img. Go ahead and extract it to the folder the other parts of the ROM are in.

will be look like THIS pic or see attachment ..

Unzip the FlashTools.zip and copy the following 4 downloaded files and paste it into extracted flashtools folder:

boot.img (~ 11MB)

droidboot.img (~ 13MB)

recovery.img (~ 11MB)

system.img (~ 2GB)

Disconnect your phone from PC/Laptop.. Power it off. Once it is off, hold down the volume up button and hold on to the power button until the phone vibrates. After the vibration stops, release the power button and continue pressing the volume up button until the green Android robot appears. You should see a blue line below saying "Waiting Fastboot command or Continue the fastboot process"

Now connect your phone via USB to your computer.

At the flashtools folder press Shift + Right Click.. Then select "Open command here"...

Copy and paste the following commands in the command prompt window (line by line) and press enter after each line. WAIT for the process to complete before copying and pasting the next line:

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

The flashing of system.img will take huge time to show any text after max size info,after some more time 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.

Now open Supersu[it will ask for su binary update,click NO],and click unroot from options of supersu,reboot once

Now u have stock without any modification,you can apply OTA manually for sure..not sure on FOTA about bootloop..

Using ADB sideload:

go here for ZE551ML[for 2g and all 4gb versions] ,go here for ZE550ML

choose Android in OS,then click firmware,in that get latest the zip of ww[ww-world,TW-taiwan,JP-japan,CN-China]

create a folder called adb in any drive in your pc/lap,put the zip you download there and rename the zip as "file"

Disconnect your phone from PC/Laptop.. Power it off. Once it is off, hold down the volume up button and hold on to the power button until the phone vibrates. After the vibration stops, release the power button and continue pressing the volume up button until the green Android robot appears. You should see a blue line below saying "Waiting Fastboot command or Continue the fastboot process"

Now connect your phone via USB to your computer.

At the adb folder press Shift + Right Click.. Then select "Open command here"...

Copy and paste the following command in the command prompt window

adb sideload file.zip

Wait until the process is complete ,then rebooot ,thats all

Using Stock.zip from ASUS site:

go here for ZE551ML[for 2g and all 4gb versions] ,go here for ZE550ML

choose Android in OS,then click firmware,in that get latest the zip of ww[ww-world,TW-taiwan,JP-japan,CN-China]

now rename the zip which you download to "MOFD_SDUPDATE" zip and paste it in external SDCARD[external not internal]

now power off, Once it is off, hold down the volume up button and hold on to the power button until the phone vibrates. After the vibration stops, release the power button and continue pressing the volume up button until the green Android robot appears. You should see a blue line below saying "Waiting Fastboot command" ,Now here click vol down till you see Recovery mode in top big rectangle box,now click power button,and thats all it will restore your phone..

Steps to Apply OTA manually:

[Note: please confirm that you didnt modified or removed any system apps,files]

Download the OTA file from here, check under ota update heading [get the latest one ,check the version number]

rename the OTA zip which you download to "MOFD_SDUPDATE" zip[verify with this PIC], paste the renamed zip in external memory[not in internal, tried to place in internal but it didnt work]

now power off, Once it is off, hold down the volume up button and hold on to the power button until the phone vibrates. After the vibration stops, release the power button and continue pressing the volume up button until the green Android robot appears. You should see a blue line below saying "Waiting Fastboot command" ,Now here click vol down till you see Recovery mode in top big rectangle box,now click power button,and thats all it will update your phone..

hope this helps you