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applelex

macrumors newbie
Original poster
Just hopped on the public beta 6 and my ancient Canon printer connected via USB cable was “no longer supported” as shown in print dialog. Rosetta is installed. Re-adding printer did not resolve the error. Didn’t want to buy a new one because the old one has more ink than some new printers cost.
I was able to get the printer working by connecting via AirPrint/bonjour (wireless).

Keep in mind if your printer is as old as mine:
Printer probably only supports 2.4 ghz wireless, so if your network shares the same name as a 5 ghz, you might need to turn off the 5ghz channel temporarily to join or make sure you join your 2.4 GHz network (probably has 2.4 GHz in the name)
Also, most likely the printer won’t support wpa3 encryption, so you might need to make sure that wpa2 is also active for older devices (maybe even all the way back to wpa if printer is that old).
 
I have been running separately named WiFi channels for some time because otherwise my oldish Kasa table lamp plug switches get stroppy and my Garmin Edge bike computer gets downright uncooperative. These devices only work over 2.4GHz and the switches are unreliable on a joint network and the Edge times out. Get a 2.4 only channel going and it solves the problems.
 
If you have more than one wifi network, then...
... try setting up the printer while connected to EACH of the networks.

One may work, when the other does not...
 
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