Hi all. I'm getting the "App error 523 reset" message when my 8520 boots. I've tried to wipe it with BBSAK and Jl cmder but when i connect via the USB cable i get a message from windows saying USB device not recognized. I know my ports are fine because I flashed my 9530 after to make sure. Not certain if the app error is related to the error message I'm getting, or if the USB port is damaged. It is taking charge though. Any assistance would be appreciated.