Firmware here - please be careful or your watch will be toast !!
Extract with 7zip…!!
For 4+64GB
For 1+16GB without the Pixart chip
It is vital that you understand how to use it on a Windows computer otherwise you will brick the watch.
Once drivers are installed and you have loaded the firmware into the flash tool program and clicked the flash icon (looks like a “play” button - you need to connect USB cable to the watch, then press and hold the top button on the watch and connect the other end of the usb cable to your computer - while watch is still powered off!!
Flashing will begin immediately and you can release the top button on the watch.
You must be sure not to disturb the connection while it is flashing.
Once it is completed you can close the flash program and disconnect the watch.
Wait for about 30 seconds and then power up the watch. It will take a long time to boot up.
64 version includes tools - 32 version you need to download tools posted below.
How to use SPD Upgrade Tool to install or flash .pac Stock ROM (firmware) (androidmtk.com)
Cheers
Pablo11