what flash drives have you used to update the appradio 2? I want to make sure i get one that is sure to work as the ones I have failed

I used a generic radio shack one 32gb, just make sure it's formatted as fat32.

I have tried several drives and non take the update. They all give me the error about making sure I only have one file on my drive which i do. Anyone can give me the exact usb drive model/brand they used?

I also cant update - have tried 8 different drives - if you find anything please let me know and I will do likewise

How are you formatting it? Using the OS tools tend not to be that successful. You need to use a 3rd party formatting tool.

you know when you say can't format , is that can't because the handbrake wire isn't grounded ? You do need the bypass or brake wire attached to update or the firmware update option isn't enabled.