I have a CH420 Chip Arduino and it doesn't allow the user to enter DFU mode which means that I can't burn new firmware onto it. My end goal was to make the Arduino unlock the PC when I put the correct RFID card onto the RFID reader. I've done the first half of reading from the RFID reader but I have to make the PC think that the Arduino is a keyboard. But all the sources say that the Arduino clone which uses the CH420 chip means that it can't be used for this purpose. Which is actually a good thing now that i wonder about it. But I don't have any malicious intent with this project, so are there any solutions maybe anyone knows?

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