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?

  • Since the device is unlocked with either ASUS's proprietary app or a non-conventional command, things don't look too good for you...
    – Andy Yan
    Jan 16, 2017 at 8:21

2 Answers 2


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-

Asus Zenfone 2 Laser ZE500KL: http://dlcdnet.asus.com/pub/ASUS/ZenFone/ZE500KL/UL-ASUS_Z00E-WW- Adb fastboot Tool USB drivers Laser ZE550kl

How to Flash Stock Rom on Zenfone 2 In this tutorial I'm taking WW_1.16.40.763 in ZE550KL/ WW_12.8.5.222 in ZE500KL as an example.

Step 1. Once you have downloaded the full stock rom, rename the zip file to WW_1.16.40.763 / WW_12.8.5.222

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

  1. Turn off your Zenfone 2
  2. Go to recovery mode (Tutorial HERE)
  3. Select apply update from ADB
  4. Connect your Zenfone 2 to your PC with USB cable
  5. Open command prompt in Windows (in the same folder where ADB is located)
  6. Check connection by type adb devices if connection successful will be a list of Zenfone 2 device
  7. Type adb sideload file.zip (file.zip=adjust the filename, asus zenfone firmware that you download earlier)
  8. Wait until the process is complete
  9. Zenfone 2 will flash to clean thoroughly

Hope it helps.

  • What about relock? Since the ultimate goal of OP is to prepare the phone for warranty, the remaining unlocked bootloader is certainly not ideal.
    – Andy Yan
    Jan 17, 2017 at 11:45

After doing the above answer's steps run fastboot oem lock to relock the bootloader.

  • Do you own this device? From the XDA thread I linked above, it seems unlocking is a one-way effort (like most ASUS devices), and relocking hasn't been achieved yet. If you have any concrete proof that this command works on this exact device, please raise them.
    – Andy Yan
    Jan 21, 2017 at 0:02

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