Firmware update error

[InfocuspSamyakVora]

I was trying to install custom stable firmware but I am getting firmware update error and now I couldn't find the watch and connect it with android applications - Gadgetbridge, NRF connect, BLE scanner.
Also tried connecting from multiple android devices and an iphone.

We have tried a few things for solving this issue:

1. Restarting the mobile as well as watch multiple times
2. Rolling back watch’s software version to a previously validated version
3. Checked out related github issues here but nothing worked for me Update 1.6.0 to 1.7.0 fails with "Error" #831
4. Tried completely discharging battery and starting fresh.

Now I am blocked by this issue, can neither update the firmware nor connect mobile with my watch.