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Single red blink on reset


A-Star 32U4 Mini SV. Was working fine until I tried to power it externally from an 18V power adapter.
Now it blinks red on restart and can not be programmed, no matter what’s the power source (external or usb).


I am sorry your usual method of programming is not working. Can you try following the instructions under the Reviving an unresponsive A-Star section of the A-Star’s user’s guide and see if that solves the problem?