I need to return the phone for reparation. The handset is broken. The warranty is void in the current state of the mobile phone.
How do I return to its original state?
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ASUS already upload stock ROM for ASUS Zenfone 2 Laser Series, You can download the ROM's via download links below :
Asus Zenfone 2 Laser ZE550KL: http://dlcdnet.asus.com/pub/ASUS/ZenFone/ZE550KL/UL-Z00L-WW-126.96.36.1993-user.zip
Asus Zenfone 2 Laser ZE500KL: http://dlcdnet.asus.com/pub/ASUS/ZenFone/ZE500KL/UL-ASUS_Z00E-WW-188.8.131.52-user.zip Adb fastboot Tool USB drivers Laser ZE550kl
How to Flash Stock Rom on Zenfone 2 In this tutorial I'm taking WW_184.108.40.2063 in ZE550KL/ WW_220.127.116.11 in ZE500KL as an example.
Step 1. Once you have downloaded the full stock rom, rename the zip file to WW_18.104.22.1683 / WW_22.214.171.124
Step 2. The reason why we did this is, by renaming the zip file the phone gets notified that a new version of software is available to install.
Step 3. Copy the renamed zip file to internal memory of your zenfone 2 laser.
Step 4. Disconnect the phone from pc, you'll get a notification of available update.
Step 5. Install it. Now the phone reboots with the fresh stock rom flashed in it.
If the above method not work try the below one.
How to Flash Stock Rom on Zenfone 2
Hope it helps.
After doing the above answer's steps run
fastboot oem lock to relock the bootloader.