Hi all
I have a rc522 RFID-Reader connected to a Pi ZeroW. Has worked nice over years now. But after today’s dietpi update (v8.24.1) it does not read cards anymore. No clue why.
SPI (which this reader operates over) is on. Any idea what happens here?
I guess something with the SPI is wrong.
Edit:
SOLVED!
Ok, i tried nearby everything. Rebooted many times, reinstalled all the software, studied all the logs, put on debug, spoke a lot of bad words… But i forgot rule nr.1: Remove the power, wait 30s, replug the power and try. 
After that it worked again like all the years before.