If the device is flashed using the ORIGINAL firmware option in GarminCure, it boots and device options are available. However since, it won't detect in a computer via USB, I can't load any maps onto it. So navigation is not possible.

If flashed using CURE option in GarminCure, it goes into 2 sec shutdown loop. Connected to Garmin Express. It’s able to detect it before it shutdowns in 2 secs. Was able to install Garmin Express update (after multiple attempts during shutdown) but device still continues to shutdown.