Lexmark puts out security security updates for it's printers, also for my oldish ms415dn model; the latest firmware was released in June 2018 (LW70.TL2.P022) -- that's good, it fixes 10 CVEs (KRACK), updates OpenSSL, and adds SMBv3 support.
Yet the detailed release notes fail to mention that the new firmware also disables 3rd party toner cartridges (resulting in error code 32.46, unsupported cartridge). And Lexmark makes in rather difficult to diagnose the problem and downgrade the firmware, leaving you with a non-functional printer at an inopportune time (a.k.a. weekend) -- WTF?
Here's how to get the printer back:
All information is there, just a pain-in-the-ass to find. Lexmark, you can do better!
Lexmark, if you disable toner cartridges for whatever reason, say so in the release notes! I might even understand... but stop this foul play; communicate openly.