Nice find! I had an ASAIR that wasn't working and I could not tinker with it like I could with astroberry, which led me down exactly the same path as you.

Astroberry before rpi-update:
[ 5467.485644] usb 1-1.2: new full-speed USB device number 10 using dwc_otg
[ 5467.619027] usb 1-1.2: New USB device found, idVendor=067b, idProduct=23d3, bcdDevice= 4.05
[ 5467.619047] usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 5467.619060] usb 1-1.2: Product: USB-Serial Controller
[ 5467.619071] usb 1-1.2: Manufacturer: Prolific Technology Inc.
[ 5467.619082] usb 1-1.2: SerialNumber: A8COb19B616

Astroberry after rpi-update:
[ 391.746973] usb 1-1.5: new full-speed USB device number 4 using dwc_otg
[ 391.880389] usb 1-1.5: New USB device found, idVendor=067b, idProduct=23d3, bcdDevice= 4.05
[ 391.880417] usb 1-1.5: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 391.880433] usb 1-1.5: Product: USB-Serial Controller
[ 391.880448] usb 1-1.5: Manufacturer: Prolific Technology Inc.
[ 391.880463] usb 1-1.5: SerialNumber: A8COb19B616
[ 391.984895] usbcore: registered new interface driver usbserial_generic
[ 391.987019] usbserial: USB Serial support registered for generic
[ 391.993006] usbcore: registered new interface driver pl2303
[ 391.994878] usbserial: USB Serial support registered for pl2303
[ 391.995467] pl2303 1-1.5:1.0: pl2303 converter detected
[ 391.996487] usb 1-1.5: pl2303 converter now attached to ttyUSB0

I spent three days tearing my hair out pleading with ZWO and SkyWatcher support for them only telling me to change the baud rate.. very frustrating.

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