[HOWTO (FIX)] Unlock Check Fail fix

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If you're getting an "unlock check fail" error, take these steps to successfully unlock your bootloader, flash recovery, root, and upgrade back to .29.

Step 1:

Backup anything you want on your tablet using titanium backup (if you're already rooted) or app backup if you prefer. (**These steps will erase EVERYTHING on your tablet**)

Step 2:

Backup the backups onto your computer (again, it will even erase the sdcard partition)

Step 3:

Downgrade to .17 using this method: http://forum.xda-developers.com/show....php?t=1645029 (using viperMOD)

Step 4:

Use the "Factory Reset" option under Settings > Backup & Reset (**again, EVERYTHING WILL BE DELETED OFF THE TABLET**)

Step 5:

Once that's done, it should reboot and bring you to the setup screen, you can skip setting up everything and just go straight to the home screen. Now, install the Unlock apk from ASUS and unlock, it should work fine now.

Step 6:

Once that is done, to get back up to .29, follow Step 3 again, but instead of using a .17 blob file, download the .29 update from the ASUS website (http://www.asus.com/Tablet/Transform...300T/#download), unzip the zip, then unzip the zip that's inside of that and that should have the .29 blob file. Use the same method as Step 3, except with this .29 blob file instead of the .17 blob file.

Step 7:

Once you've confirmed you're back on .29, you can go ahead and flash CWM and root using this method: http://forum.xda-developers.com/show....php?t=1668173

And you should be good!

**Note: There seems to be some issue with tablets with the serial number starting with C4OKCT so this may not work for those tablets. Mine starts with C3OKCT so it worked fine. You can verify your serial number from the sticker on the tablet (if you haven't removed it yet) or Settings > About tablet > Status

Originally Posted by Berzerker7

If you're getting an "unlock check fail" error, take these steps to successfully unlock your bootloader, flash recovery, root, and upgrade back to .29.

Step 1:

Backup anything you want on your tablet using titanium backup (if you're already rooted) or app backup if you prefer. (**These steps will erase EVERYTHING on your tablet**)

Step 2:

Backup the backups onto your computer (again, it will even erase the sdcard partition)

Step 3:

Downgrade to .17 using this method: http://forum.xda-developers.com/show....php?t=1645029 (using viperMOD)

Step 4:

Use the "Factory Reset" option under Settings > Backup & Reset (**again, EVERYTHING WILL BE DELETED OFF THE TABLET**)

Step 5:

Once that's done, it should reboot and bring you to the setup screen, you can skip setting up everything and just go straight to the home screen. Now, install the Unlock apk from ASUS and unlock, it should work fine now.

Step 6:

Once that is done, to get back up to .29, follow Step 3 again, but instead of using a .17 blob file, download the .29 update from the ASUS website (http://www.asus.com/Tablet/Transform...300T/#download), unzip the zip, then unzip the zip that's inside of that and that should have the .29 blob file. Use the same method as Step 3, except with this .29 blob file instead of the .17 blob file.

Step 7:

Once you've confirmed you're back on .29, you can go ahead and flash CWM and root using this method: http://forum.xda-developers.com/show....php?t=1668173

And you should be good!

**Note: There seems to be some issue with tablets with the serial number starting with C4OKCT so this may not work for those tablets. Mine starts with C3OKCT so it worked fine. You can verify your serial number from the sticker on the tablet (if you haven't removed it yet) or Settings > About tablet > Status

THANKS MY FRIEND... I was already downloaded (by a wired ASUS OTA from .29 to .17 ) I did the factory reset and got the Unlocker to work.... back to life.

Nice, thanks for typing all that out.

Can't wait to try it out. Thx

Sent from my Galaxy Nexus using Tapatalk

Has anyone with the Serial C4OKC had success with this, or problems?

Originally Posted by Berzerker7

If you're getting an "unlock check fail" error, take these steps to successfully unlock your bootloader, flash recovery, root, and upgrade back to .29.

Step 1:

Backup anything you want on your tablet using titanium backup (if you're already rooted) or app backup if you prefer. (**These steps will erase EVERYTHING on your tablet**)

Step 2:

Backup the backups onto your computer (again, it will even erase the sdcard partition)

Step 3:

Downgrade to .17 using this method: http://forum.xda-developers.com/show....php?t=1645029 (using viperMOD)

Step 4:

Use the "Factory Reset" option under Settings > Backup & Reset (**again, EVERYTHING WILL BE DELETED OFF THE TABLET**)

Step 5:

Once that's done, it should reboot and bring you to the setup screen, you can skip setting up everything and just go straight to the home screen. Now, install the Unlock apk from ASUS and unlock, it should work fine now.

Step 6:

Once that is done, to get back up to .29, follow Step 3 again, but instead of using a .17 blob file, download the .29 update from the ASUS website (http://www.asus.com/Tablet/Transform...300T/#download), unzip the zip, then unzip the zip that's inside of that and that should have the .29 blob file. Use the same method as Step 3, except with this .29 blob file instead of the .17 blob file.

Step 7:

Once you've confirmed you're back on .29, you can go ahead and flash CWM and root using this method: http://forum.xda-developers.com/show....php?t=1668173

And you should be good!

**Note: There seems to be some issue with tablets with the serial number starting with C4OKCT so this may not work for those tablets. Mine starts with C3OKCT so it worked fine. You can verify your serial number from the sticker on the tablet (if you haven't removed it yet) or Settings > About tablet > Status

Not working for me with C4OKCT

Originally Posted by danthrax66

Not working for me with C4OKCT

Same here. I have had no issues with OTA's or anything else. This is the only issue I have had.

**EDIT** I am on .29, shut down and did a cold boot. Did a wipe data/factory reset. Reinstalled the unlocker and voila success. I am now off to install CWM Recovery. I tried this first and it worked as I didn't want to have to go downgrade and unlock and upgrade again.

Would have been lost without this guide, thank you!

Got a response back from the email tech support... was told to call the service center. IT'S A DATABASE ISSUE JUST ADD MY SERIAL TO THE DATABASE.

Hopefully someone will be able to reverse engineer the unlocker so I don't have to wait for Asus to fix a problem that shouldn't exist.

Worked like a charm on my C4OKCT.