Tell me, Frans, with the nozzle check pattern image that I posed, what would you have considered the issue to be (if you had any idea at all) assuming I hadn't told you what the problem was? I don't believe you would have had any idea, but I knew straight away, and I was correct. I'm sure there are things you know or can deduce that I can't, and some of them maybe I couldn't even learn how to do it, but I wouldn't assume such things were impossible just because I wasn't familiar with them.
I'm not guaranteeing that I could correctly diagnose your problem, but I am saying there are many things you can determine from nozzle check patterns. I also told you twice that the printer you have doesn't have an ink level detection sensor. It counts dots fired and subtracts from the original total and write a current total to the chip. You've ignored being told that twice.
Again, I don't care if you believe me or not - really - it affects me not at all :-) You, on the other hand, might get some useful advice on how to work out what's wrong with your printer if you care to listen. If not, all good, but don't come here and tell me I can't do something just because you can't.