Quick background: I ordered on April 2016 a pre-order Arduboy. Once I got it in the summer of 2016, I installed a game on it, played it for a week or so, then got distracted building other retro handheld game emulators ever since. Recently I read a hack-a-day article about the FX mod chip and thought that’s a great idea, let me order one! Found where I left my Arduboy, charged it up and played the game I installed long long ago. Still works great!
The Pre-Programmed FX Mod chip I ordered was super easy to solder in. I followed the directions from Arduboy – Start FX and reset it via the reset button (also tried shorting GND and RST) for 5 seconds. I then waited 30 seconds. All I ever see on the screen now is “USB boot”. During installation, I used kapton tape to lock in the mod chip location to make the soldering easier (been doing SMT soldering for decades now). Just in case, I’ve reflowed the solder connections multiple times with no improvements. Also used a DVM to ensure there were no shorts between the solder connections I made.
Is it possible that I had such an old bootloader installed previously on my Arduboy that the pre-programmed FX mod chip can’t boot?
Any other debugging or troubleshooting tips I should try?