The problem of the full waste ink tank was very easy to solve. Remove the container, clean, wash out the sponges, dry and you're done. But without a WIC reset, it wouldn't have helped. The printer continued to show full and did not work. I downloaded WIC reset and tried it with the trail password. It worked immediately, the display went back to 73%. On the one hand I wanted to solve the problem for a long time, on the other hand I think it is right to promote such innovative solutions. So I bought a full version and entered the code I had received. The printer immediately showed that the container was empty now. So the printer will work again for years.