HP OfficeJet Pro 7720 no longer recognizes cartridges?

Hello everyone, I had already swapped the yellow and red cartridges a while ago… Everything was working fine until yesterday… Now the blue and black cartridges were empty too. I wanted to swap them (same brand as the yellow and red). Now the printer no longer recognizes any of the four cartridges… The version on…

Downgrade possible thanks to version control?

Hello everyone We have the following situation. We are currently implementing a new software. The manufacturer is sending us key account managers who aren't very technically savvy. So far, so good. We were just discussing whether we could perform a software downgrade on the test instance in case of an emergency. The manufacturer said, "Not…