OK, after rebooting printer lost usage statistics (i.e. only overall ink/paper usage was preserved). If I knew that in advance, I would export it first. Paper presets was there, calibration too, but I've re-calibrated anyway because it was a while since I calibrated last time. Since the exagons seemed a bit more off each other than usual, I also re-did head alignment.
Then the printer refused to print from Mac I did all the other work from. The driver reported that it no longer can connect to the printer. Interestingly it printed from Windows machine. This got fixed by removing the printer and adding it again.
Now all seems to be back in order first prints are same as usually. I think for HP Mathe Litho the printer is now printing slighly faster, or at least machine tends to resonate differently than before, but it might be just me. Can't tell for sure since the logs listing printing times was lost...
I might sound scary, but overall this seems nice update with little improvements all over the place (i.e. web server and menu was slightly extended). Especially look forward to be able to replace the cartridges.