some way to flash the damn thing at the factory
Flash-over-the-air :DD
They can flash it to put chip in special device without soldering
... and then put the chips back to the reel to feed it to the pick-n-place machine? sounds not very probable
All stm32 chips have preinstalled bootloader, how are they do it?)
it's not "preinstalled", it's physically hardwired in the ROM, my guess is they have it as a part of photomasks
i see some unpopulated through holes, but they don't look like something related to programming, maybe provisions for some other models, like LED or extra buttons. how about back side of the board?
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