Is there a way to Reinstall firmware/OS?

[Merc718]

New UI7 update messed up my fone. Bluetooth, wifi, and cellular is unstable. Is there a way to reinstall old firmware or do a clean install of UI7?

I did everything I can to fix - power reset and clear network settings all the way to factory reset, etc. Please dont recommend these basic steps.

[RedDogRabbit]

Yes, you can Flash the stock Samsung Firmware on your device. 

You'll need to download & Install; Odin, Samsung's USB Drivers to your computer, AS WELL as the CORRECT Samsung firmware.

The app that I used to download the Firmware is Frija. 

Before you Flash your device, I would backup with Smart Switch & Factory Reset BEFORE you, flash the Firmware! 

[Goldenseal]

Same for my Flip 6's cellular connection. It takes a long time to regain signal after exiting a basement or elevator.