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[Resolved] [System] Bootloader unlock tool doesn't work

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gtt1 USA Level 1 | All posts
ZenFone2 Bug Report
Model: ZE551ML
RAM: 1G
Firmware/APP Version: WW_2.20.40.198_20160930
Frequency of Occurrence: not sure
Rooted: Yes
APP Name: -
Screenshot: -
I'm having trouble using the bootload unlocker on my Zenfone 2. I'm currently using an unrooted version of Android 5.0 on the device. Developer tools are activated. When I run the asus unlock tool, the device reboots but then it says that unlock failed in red.

Phone is completely stock as I bought it. Started giving trouble about 6 months ago. Screen would randamly open programs and jump around.

I want to try and put in a different OS such as CM to see if it solves the problem

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OTHERS Level 5 | All posts
Last edited by Robex on 2017/12/17 19:33

Update to the latest version of Android 5.0 I think it is WW_2.20.40.206 and try again.

For Android 6 there is no Asus official bootloader unlock tool but I unlock it anyway.


BTW you saying that Developer tools are activated but did you enable USB debugging
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TWN Moderator | All posts
HI gtt1,

Please try update your system version to 2.20.40.206 and then check again.

For "Screen would randomly open programs and jump around", I would suggest you bring it to the local service center for a check:

https://www.asus.com/support/Service-Center-All-Countries/

Sorry for any inconvenience
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gtt1 USA Level 1 | All posts
Last edited by gtt1 on 2017/12/18 08:07

How do I update to system version to 2.20.40.206 ?

Where should I download this file from to ensure I don't get something not original?

When I check for updates it doesn't show any for me.

P.S. thanks for the replies
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OTHERS Level 5 | All posts
Last edited by Robex on 2017/12/18 21:24
gtt1 posted on 2017/12/18 15:55
How do I update to system version to 2.20.40.206 ?

Where should I download this file from to ensure ...

Well if your phone system update doesn't offer you .206 then go to official asus support site and manually download it from there................

https://www.asus.com/us/Phone/Ze ... /HelpDesk_Download/

as you can see you can redownload there the Unlock Device App: Unlock boot loader

Asus support.jpg
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TWN Moderator | All posts
Robex posted on 2017/12/19 05:15
Well if your phone system update doesn't offer you .206 then go to official asus support site and m ...

Hi gtt1,

Please follow the step that  Robex suggested:

"Well if your phone system update doesn't offer you .206 then go to official asus support site and manually download it from there"

https://www.asus.com/Phone/ZenFone_2_ZE551ML/HelpDesk_Download/

Thanks
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gtt1 USA Level 1 | All posts
I updated to system version 2.20.40.206 and the unlock tool still gives me a "unable to unlock"

Is there some other method to unlock bootloader than the Asus tool. Can I remove the tool (how?) and start again to see if a fresh install will work?
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OTHERS Level 5 | All posts
gtt1 posted on 2017/12/19 17:12
I updated to system version 2.20.40.206 and the unlock tool still gives me a "unable to unlock"

Is  ...

Yeah there are unofficial methods as well. Google it, something like '' unofficial unlock bootloader ze551ml ''
Few suggestions:
http://www.ibtimes.co.uk/how-uno ... -bootloader-1507209

https://www.theandroidsoul.com/h ... click-without-root/

http://www.techyoutubers.com/201 ... r-in-zenfone-2.html

But you may want to factory reset and try start over again, as you mentioned you wanna install custom rom and so factory reset and full wipe with custom recovery it must anyway.................
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TWN Moderator | All posts
gtt1 posted on 2017/12/20 01:12
I updated to system version 2.20.40.206 and the unlock tool still gives me a "unable to unlock"

Is  ...

Hi gtt1,

Please inbox me your device serial number(settings>about>status>serial number)

Thanks
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gtt1 USA Level 1 | All posts
So did a factory reset and started again and this time it unlocked.

Thanks for the help everyone
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