[Amazfit] Neuer_User:
In case you bricked your watch, here is a tutorial how to unbrick the watch:

1. What is a "bricked" watch?

A bricked watch does no longer boot. It typically stops at the boot logo and waits forever. This can happen for example, if a flash of the system image failed and the boot image can no longer boot the system.

In such cases, you cannot reach adb from the command line, so there seems to be no way to recover the watch. Fortunately, it has been discovered how fastboot can be entered without a running system.

2. Procedure

Step 1: Get into fastboot

This is the most difficult part. [MENTION=4490808]kiralex1995[/MENTION] has developed a procedure that will lead reproducible to boot the watch into fastboot mode, but it may take many tries (one user reported that it took him 30 min of tries).

Follow this guide: https://xdaforums.com/smartwatch/other-smartwatches/amazfit-boot-fastboot-directly-t3546829

When you are in fastboot and see the fastboot logo, you have mastered the most difficult part.

Step 2: Choose a ROM to flash on the watch

There are currently three possible ROMs to choose from:

a.) The English AmazFit firmware 1.3.0n

Download the following file on your PC: https://mega.nz/#!xIkC1IQZ!bLLSN9BMvbp7zhZHg2oQq6p4ud-EFyUYkatCGKgHeS8

b) The Chinese AmazFit firmware 1.2.5a

Download the following file on your PC: https://mega.nz/#!tNdggR4b!VXmExGqdNixrj8pVLqTkAi_munmjF5RidRJP9L-LAXE

c) An old Chinese AmazFit firmware 0.9.50:

Download the following file on your PC: https://mega.nz/#!wY9mEQoI!0ARB0MaK0byjttgrPmJJQX4ZFdIXgHOUquxqFhghg7U

Step 3: Download flash script from xda

Download the attached flash script from this post to your PC.

Step 4: Unpack the archive on your PC

Depending on you PC choose the right method to extract the files in the ROM archive and the flash script.

Step 4: Boot the watch into special recovery

Check that your fastboot drivers see that watch (which should still show the fastboot logo):

'fastboot devices'

You should see your device listed. Otherwise check your fastboot driver installation on your PC. (Note: On Linux you sometimes need to use "sudo fastboot ...".)

Then boot the modded recovery that is included in the archive you unpacked in step 2.

'fastboot boot Amazfit-mod-recovery.img'

You will see a "FAILED" message on your commandline. This is normal.

On the watch you should see the recovery triangle and the text "No command".

Step 5: Transfer the ROM files and the flash script onto the watch

First check that you are now able to connect to your watch via adb:

'adb devices'

You should see your watch listed. Otherwise check you "adb driver" installation. For Windows take care that you use Khoushs universal adb drivers.

Then push the files to the watch:

'adb push boot.img /data/media/0/

adb push system.img.gz /data/media/0/

adb push md5s.txt /data/media/0/

adb push flash_rom.sh /data/media/0/'

Step 6: Enter the shell on the watch and check your files

After you have successfully transferred the files to the watch, you then enter the shell on the watch:

'adb shell'

You should see only a "#", meaning you have full root access.

Now switch drirectory to the sdcard

'cd /data/media/0/

ls'

You should see your files on the "sdcard", including the ones that were pushed before

7. Start flashing the files

Run the flash sccript with the following command on the watch:

'sh flash_rom.sh'

If everything worked correctly, you should see something like:

Validating images
boot.img.gz: OK
system.img.gz: OK
Starting to flash now. DO NOT TURN OFF OR REMOVE THE USB CABLE! Press Enter to continue or CTRL-C to stop!

Flashing boot.img
2304+0 records in
2304+0 records out
9437184 bytes (9.0MB) copied, 2.075793 seconds, 4.3MB/s
Flashing system.img
210944+0 records in
210944+0 records out
864026624 bytes (824.0MB) copied, 107.981352 seconds, 7.6MB/s
Finished

If you see any error message during or after flashing, then DO NOT REBOOT the watch, but get some help or analyse yourself, what went wrong. You can still reflash.

8. OPTIONAL: Delete the dalvik-cache

You can erase the dalvik-cache on the watch with the following command:

'rm -rf /data/dalvik-cache'

This will make the system "re-optimize" all apps when it boots (successfully) the next time. This is optional, as you could always do that later again.

9. Reboot the watch

If everything is ok, then you can reboot the watch

'reboot'

Your watch should boot normally into the flashed system, you downloaded. CONGRATULATIONS, you unbricked your watch!