Canon Pixma iP4950: Orange LED Blinks 5 Times - Printer Head Issue & Potential Solutions

Hello.
I need help with a Canon Pixma iP4950 inkjet printer. The printer was used mainly for printing photos, so there is not much overprinted, max several dozen sheets. Recently, I was printing about six months ago.
Today, after turning on the printer, the orange LED flashes 5 times. When selecting "Printer and Ink Status Information" from the Control Panel> Windows> Devices and Printers> Canon iP4900 Series, it displays information as in the attached screenshot ("Canon error.jpg").
The manual attached to the printer says nothing about 5 flashes of the LED (attachment "Canon manual.jpg").
According to information found on the Internet, the orange LED flashing 5 times means a problem with the head. Most of the advice is "wash the head under water". I have done it many times, because it's the 3rd Canon printer in the family, so I did it now and unfortunately it didn't help. I put on a new set of carcass (I have a few spare sets) with new chips - nothing. I reset the ink level using the button combination at startup - holding the Resume button turned on the printer, released Resume, then pressed it 2 times, the orange LED flashed, released both buttons - nothing.
I downloaded the program "Service tool v3400" from this site:
https://grandcousin.com/canon-pixma-ip4950-reset.html
and I wanted to follow the instructions there, but it probably won't help, because it's about resetting the carcass level, and it seems to me that since I have chips in every set, I don't have to do it.

Please advice if I can deal with it somehow. The printer is almost like new.

I probably made the mistake of running it without ink and with a clogged head. I thought that if it had been standing and moving for 2 years earlier, now, after another six months, it will also start, and if there is no color, I will open the head and replace the carcasses. And she probably burned out.
It pays off to buy a new head? I found the cheapest for around PLN 280. Apparently this printer is very good, they use it in photo shops. If I had a new one, I would print more often and clean this topic more often:
https://www.elektroda.pl/rtvforum/viewtopic.php?p=13157452#13157452

I also found out that there are cleaning cartridges, maybe I would start using it and the new head would last longer?

Hello.
What happened to the WSI Servant user?
He offered to help me repair the head so that I could send it to him, and when I did, he stopped responding to messages, and now when I wanted to write another one to him, I can see that it has been removed.
Can someone explain it to me?