I have an issue with 2 of my Pro micro boards.
Both are the 3.3v 8MHZ version and somewhere along my coding way i did something that upset these baords.
They arent shown as USB devices anymore. I did try to reset them but shorting RST with ground, and this gives the unable to enumerate error in dmesg (macos 10.13.4, rasbian and another mac) I flashed new bootloader on the chips using the raspberry as ISP, this worked, cus i did get the blinky sketch working (the tx/rx one) but still no USB... did i mess up fuses? is something else broken... i really dont get it and am lost now trying to get the boards working again...
anyone got an idea what i can try next... (besides ditching then boards and get new ones...)