Alex replied to the topic 'ttyUSB0 issues on OnStepp and raspi4' in the forum. 2 years ago

the same here with a QHY CFW3, and the same CP210x chipset, disabled GPS, and also I needed to solve CFW3 problem on EKOS (error: Handshake failed: Timeout error. Firmware must be higher than 201409) I changed EKOS to use a CFW2 and now is working.