I don't know if anyone has solved their update issues involving it not showing a USB and just automatically saying there's an update but I had the same issue even after enabling QA in the REBUG Toolkit and solved it by going to SETTINGS>DEBUG>SYSTEM UPDATE DEBUG and turned that on. After that I...
I don't know if you solved your issue or not but I had the same issue and solved it by going to SETTINGS>DEBUG>DEBUG SYSTEM UPDATE and turned that on. Even if you did figure it out and didn't post it at least others having the same issue might be able to try this
