my gopro hero 8 freezes after startup ,not connecting to pc and doesn't accept updates .
What SD card are you using?
How are you updating the camera?
Please try a manual update. See https://gopro.com/en/us/update/hero8-black
Let us know how it goes.
You may also reach out to our Support Team through https://gopro.com/help/ContactUs to have this checked further.