i updated the CircleOS, and install aplications for test my device, maze, breakout, but my lcd not run, someone know the problem or the form to restore my stm32 primer2.
thanks, I've install OS with "Restore_Primer2_Circle_Factory.bat" and I used the command that you write, it functioned correctly, but still not running.
So i guess it's either display problem or U17 is dead. U9 is alive, otherwise you would not be able to restore the software. try doing hard reset: remove battery jumper and disconnect from usb, after a few minutes reconnect to usb. if that won't do the trick - your primer is probably damaged. One way to know for sure is to measure the output voltage. if U17 is dead you won't see anything on screen or hear any sound. see more in FAQ.