Because I was bored, I thought about upgrading buster to bullseye just to see what would happen.
Do not run this RPI-UPDATE.
This program updates the rpi firmware and breaks the sbitx software. It changes WiringPi and doing a rebuild does not reset it. Also running the sbitx/update does not help. I had to replace the sdcard with a backup to get the radio working again.
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Leo, AI5II
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