Greetings ,
I'm not seeing any firmware available for this printer.
Canon Support for PIXMA TS3722 | Canon U.S.A., Inc. https://share.google/WL7YafBrjsi5okPYX
Normally it would be on the support portal for the device if it were available.
~Rick
Bay Area - CA
~R5 C (1.1.2.1), ~R50v (1.1.1) ~RF Trinity, ~RF 100 Macro, ~RF 100~400, ~RF 100~500, ~RF 200-800 +RF 1.4x TC, BG-R10, 430EX III-RT ~DxO PhotoLab Elite ~DaVinci Resolve Studio ~ImageClass MF644Cdw/MF656Cdw ~Pixel 10 ~CarePaks Are Worth It
