Released on asus website 14/12/2015:
Marshmallow:
http://dlcdnet.asus.com/pub/ASUS/ZenFone/ZE551KL/UnlockTool_ASUS_AndroidM20160928_Singed.zip
Lollipop:
http://dlcdnet.asus.com/pub/ASUS/ZenFone/ZE600KL/ZE600KL_UnlockApp.zip
The APKs for each are binary identical, so it is not really important which unlock utility you download.
Frequently asked questions:
Q: will this work on ZE500KG / ZE500KL / ASUS_Z00RD / ASUS_Z00RD_5 / ASUS_Z00RD_7 / ASUS_Z00ED / ASUS_Z00EDB / ASUS_Z00E_1 / ASUS_Z00E_2 / ASUS_Z00E_3
A: we do not think so, but we do not know if anyone has tried it.
Q: can I relock bootloader?
A: we do not have a way of re-locking bootloader right now. Hopefully it will be possible using a backup of some partition to restore original bootloader, but we have not found it yet.
Q: can I restore my warranty by re-locking the bootloader?
A: we believe that ASUS records the serial number of the device through the unlock utility, so it will not be possible to make a warranty claim even if you do manage to re-lock the bootloader.
Q: can I still receive OTA updates?
A: we do not know, because no updates have been released since the unlock utility was released.
Q: can I still update firmware manually?
A: yes, definitely. fetch the new firmware zip from ASUS website and flash in stock recovery or transfer to root of sd-card and boot the phone normally (it will find the update zip file and prompt you).
Download notes from the site:
Marshmallow:
http://dlcdnet.asus.com/pub/ASUS/ZenFone/ZE551KL/UnlockTool_ASUS_AndroidM20160928_Singed.zip
Lollipop:
http://dlcdnet.asus.com/pub/ASUS/ZenFone/ZE600KL/ZE600KL_UnlockApp.zip
The APKs for each are binary identical, so it is not really important which unlock utility you download.
Frequently asked questions:
Q: will this work on ZE500KG / ZE500KL / ASUS_Z00RD / ASUS_Z00RD_5 / ASUS_Z00RD_7 / ASUS_Z00ED / ASUS_Z00EDB / ASUS_Z00E_1 / ASUS_Z00E_2 / ASUS_Z00E_3
A: we do not think so, but we do not know if anyone has tried it.
Q: can I relock bootloader?
A: we do not have a way of re-locking bootloader right now. Hopefully it will be possible using a backup of some partition to restore original bootloader, but we have not found it yet.
Q: can I restore my warranty by re-locking the bootloader?
A: we believe that ASUS records the serial number of the device through the unlock utility, so it will not be possible to make a warranty claim even if you do manage to re-lock the bootloader.
Q: can I still receive OTA updates?
A: we do not know, because no updates have been released since the unlock utility was released.
Q: can I still update firmware manually?
A: yes, definitely. fetch the new firmware zip from ASUS website and flash in stock recovery or transfer to root of sd-card and boot the phone normally (it will find the update zip file and prompt you).
Download notes from the site:
Unlock Device App: Unlock boot loader
Notice:
1. Update your software image to V1.15.40.771 or latest version
2. Before you download, install, and use the Unlock Device App you acknowledge and assume complete risk to the quality and performance of this App, including but not limited to the following: once you activate the App you will not be able to recover your ASUS product (“Original Product”) back to original locked conditions; the Original Product with the activated App will not be deemed the Original Product; the Revised Product will no longer be covered under the warranty of the Original Product; the software of Revised Product will no longer be deemed the software of the Original Product and can no longer receive ASUS software updates; your purchased digital content may also be affected.
You also acknowledge ASUS does not guarantee service satisfaction to any Revised Product, including events involving paid service requested by you to be performed to the Revised Product.
Furthermore, such repaired Revised Product will not be covered under the warranty of the Original Product; the software of the repaired Revised Product will not be deemed the software of the Original Product and will not receive ASUS software updates.
It is strongly advised that you avoid activating this App unless you fully understand and accept the risks that may arise.
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