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ZenFone2 Bug Report
Model: ZE601KL
Firmware/APP Version: UL-Z00T-WW-21.40.1220.2170-user
Frequency of Occurrence: LTE
Rooted: No
APP Name: N/A
Screenshot: -
Hey there...
I recently unlocked my bootloader to install some custom ROMs and stuff.. But for upcoming some year I will be out of station and also away from Home..
So now I want to flash the stock Firmware for my ASUS ZE601KL.
I have a older Stock recovery for the same phone.. I have downloaded the official latest firmware for my phone from ASUS website.
The old recovery(Stock) I have, is not allowing me to flash the latest firmware package giving an error "Signature verification failed". I have tried adb sideload method also.. but that is giving same error.
The Version of stock firmware I have is :- UL-Z00T-WW-21.40.1220.2170-user
The Recovery image I have is :- WW_USER_21.40.1220.1902_20160927.
so if any moderator or any user helps me that will be realy good..
I just need the latest stock recovery..or any guide through which i will be able to flash the latest stock firmware.
Thanks ALL..
I am including all screenshots.
Hope I'll get answers soon..

Stock recovery

11.11 MB, Downloads: 1550

OTHERS Level 6 | All posts
You seem to skip a lot of Stock Firmware versions in between. 

First try updating to 21.40.1220.1998 / 2153 then jump to latest or update one by one.

Follow method given in this link or Apply Update from SDCard.
IND Moderator | All posts
Hi Pritampakhira.94,

Kindly visit the service center
MAX_ASUS posted on 2017/12/20 14:06
Hi Pritampakhira.94,

Kindly visit the service center

LOL....As u can see me being a little bit techie, I dont need to visit a Service Centre...
I just installed all images back to back starting from  WW_USER_21.40.1220.1902 to UL-Z00T-WW-21.40.1220.2170...Eventually the recovery updated and I am enjoying Stock ROM again..
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