I tried update via Bluetooth first. Same read write error as everyone, tried everything suggested above. Added my own attempt connecting via my shortboard (in case it was the usb port on the amp that cause fail). No joy. Now I cant connect via Bluetooth either, so have a brick instead of an amp. No worries as I have non modeling tube amp, but line6 lost a customer here. My time is worth more (to me, obviously not to line6) than the amp... so I'm done. Recommend no one do the update until you read whatever the USB issue is has been fixed.