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Problem of uart and usb stm32l47

Question asked by Oussama Ben yadem on May 10, 2018

hello, I have three identical electronic cards inculcate the chip stm32l47 and I raised the soft correspendant on these three cards via protocol uart but the problem what two functional cards and the other I have been soft but the protocol uart and the usb not functional knowing that I could soften the cards.