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[Other] Downgrade ASUS Zenfone 2 Laser (ZE550KL) from Marshmallow to Lollipop

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pritamistu IND Level 3 | All posts
Hey Folks,

Asus provided the latest Marshmallow update to its Zendfone 2 Laser (ZE550KL). But the fact is ASUS could not make their customers happy with the update. The ROM is full of bugs and important features are missing. The previous lollipop versions are very much stable. Those who are regretting by upgrading to Marshmallow and want to go back to Lollipop then you are on the right page. I am going to give step by step instructions for downgrading to Lollipop. The procedure does not require root or it does not unloack your bootloader. But I am not responsible if anything happen to your device or you brick your device. Do this at your own  responsibilty. The process is simple. Lets start.

A) Things you need-
     1) Windows or Linux OS installed in your PC.
     2) ADB and Fastboot application and drivers.
     3) Stock recovery image of lollipop version of ASUS ZE550KL.
     4) Official Lollipop ROM for ASUS ZE550KL.

B) Instructions-
     1) Download the ADB installer/ADB Setup version 1.4.3 and install it in your computer (Go to google and search ADB installer version 1.4.3). Do not forget to install ADB drivers at last.
     2) Download the Stock lollipop recovery image (Version 1.16.40.763; StockBoot.img). (Go to google and StockBoot.img for asus zenfone 2 laser ZE550KL). Place the recovery image/StockBoot.img to a folder named "Recovery" in your computer.
     3) Download the official lollipop ROM zip file from ASUS support website. Preferred version is WW1.16.40.763, WW_1.17.40.1234, Version WW_1.17.40.1531. Place the ROM on your Device SD Card.
     4) Power off the device and Power it on by holding POWER and VOLUME UP button together. You should boot in to FASTBOOT MODE.
     5) Connect the device with your computer via USB while your device is on Fastboot mode.
     6) Open command promt on the folder where StockBoot.img or recovery image was kept. (Go to Recovery folder on your computer and do Shift>Right Click>Open command window here)
     7) Type the follwing command in the command prompt-
            fastboot devices
            If your device is connected correctly with the computer and fastboot is working in your computer the you should see the device serial number. If not then search google for troubleshoot fastboot in your computer.
      8) If fastboot is working as it should then write the following command in command prompt
            fastboot flash recovery StockBoot.img or  fastboot flash recovery <name_of_your _recovery_image.img>
            It should write the recovery in to your device's recovery partition with a success message.
      9) Now hold the POWER BUTTON and VOLUME DOWN key together for 10 seconds. Your device will reboot and it will show the recovery options in your device.
    10) Do a factory reset from the option then naviagte the to the option "Apply update from SD Card". Locate the lollipop ROM zip file in your SD Card and select it.
    11) Wait for 15 minutes. It will automatically install lollipop in your device. Setup your device once installation is finished.

Best Regards,

Pritam Saha
Props
IND Moderator | All posts
Hi Pritam,

Thank you for sharing this information with us.

This post will be moved to fan share section.
Props
IND Level 1 | All posts
Not Working Always Stuck At Verifying Update Package...
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pritamistu IND Level 3 | All posts
PritamzDeno have some patience. It takes time to verify the update zip file.
Props
IND Level 2 | All posts
not working showing cant mount urdevice update failed
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BGD Level 1 | All posts
Cant' flash unsigned image... which one is signed image ?
Props
PHL Level 1 | All posts
This work's in my zenfone 2 laser thanks for sharing
Props
IND Level 1 | All posts
his work's in my zenfone 2 laser thanks for sharing
Props
i get work link in Zentalk Indonesia and this workd : http://www.asus.com/zentalk/id/thread-76922-1-1.html



Props
IND Level 1 | All posts
Can you provide the link for downloading the stockboot.img file
Props
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