I have a bunch of pro mini clones. from different Distributors, differently looking. (means they don't have the same production issues).
They all worked fine, but once in a while, some suddenly stopped working. (i cant see any pattern in lifetime, programs flashed or so)
So the Problem looks very simple: The LED13 flashes very fast (like 10Hz) and the uploader gives the standard "not in sync" error.
at the Moment i have 10 of these "broken" arduinos acting all the same.
Did anyone of you ever have that Problem before? do you know a solution? Is it a broken bootloader?
I would be happy about any advice you could give me :)
PS: I did search the Internet but couldnt find anything about that specific issue and all wiring was trible-checked (Voltage etc...), so that is definately thot the Problem.