DJ 2545 incorrectly claims I've used the wrong WiFi password

[mercat68]

Hi. I recently upgraded my WiFi router from a Netgear Nighthawk AC2600 to a Netgear AX1800 three-station MESH system. When I try to connect my 2545 wirelessly to this new router, the HP setup software says I've used an incorrect wireless password. I am certain I've entered the correct password (multiple times). I've reinstalled, reset, and rebooted everything, including the router and printer. Any suggestions for what I can try next? Thanks.

[mercat68 · Accepted solution]

Replying to my own question, because I've solved it (adding this in case others have the same problem). The printer needed a firmware update. I initially looked for firmware under "2545" and found nothing. But then checked the 2540 series and found a July 2020 update there. Connected fine to wireless after that update.