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Hi,
I tried to build firmware from GPL on the device but device became unresponsive. Can you give me process to factory restore the device? I guess that the problem was due to size of the firmware (45MB) with a lot of packages selected during the build.

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Hi,

Could you tell me what is the model number of your device?

EB.
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It's Asian version. 

TRB140 0*****
 
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It's Asian version. 

TRB140 0*****
 
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1. Turn off/unplug TRB140;

2. Press and hold reset button, at the same time plug the power cable and keep holding reset button for about 5 seconds (mobile signal LED's should start blinking);

3. Download and install adb from this link: https://forum.xda-developers.com/showthread.php?t=2588979

4. Open CMD with admin rights;

5. Download rootfs.ubi (https://we.tl/t-ZRCwToaBb8)

6. Use cd command to navigate to the place where you saved the tlt-rootfs-trb1400.ubi file (Example: cd C:\Users\ma.ju\AppData\Local\Temp);

7.Then use this command: fastboot flash rootfs_a tlt-rootfs-trb1400.ubi ;

8.When it completes the process use this command; fastboot flash rootfs_b build/tlt-rootfs-trb1400.ubi ;

9.When it is done unplug and plug your device again, it should boot up as normal;

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Thank you. Will try and let you know.