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The new STM32 chips arrived today and I tried flashing them, but I still got a ‘failed to unit error’. After searching the onstep forums again, the issue has become a lot more pervasive but a solution was found earlier this month: the R3 resistor needs to be removed and bridged.
I tested on one of my older boards and it worked! I have now fixed all my ‘dud’ boards.
I’ve now received all the parts and try finish the electronics this week.
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