Alright, I tried it. Absolutely nothing happened.
I hooked up my USB drive to the App Radio 2 (SPH-DA100) and tried to follow the AppRadio+ instructions below. The first time I started at Step 3 to attempt and install AppRadio+ right over the AppRadio 2 firmware. Nothing happened. Second, I started at step 1 and attempted to install the AppRadio 1 (SPH-DA02) firmware and again nothing happened. I welcome any tips on installation. When I tried, the AppRadio started up as it normally does and asked to connect my smart phone; paid no attention to the USB drive.
1. update to the late