hello, spend more than a day on perusing the internet with the search argument in google search "5b00" canon mg5250 ... there are some youtube videos but this did not help ... only veeeerrryyyy frustrating (think the purpose of the videos is to get views, NOT to solve anything... on the contrary the longer the problem remains, the more clicks... disgusting... So finally it began to dawn on me that the "service program" is the way out ... for a few dollars/euros i can get rid of the "problem" ... the problem is not so much the POTENTIAL overflow of the waste ink.... the real problem is the programmed obsolence... iam glad to pay to thwart this approach of canon (and who knows so many more companies) so thank you for the program :-) ALSO the payment with paypal suits me and the immediate availability of the key... which solved at least the 5b00 error tx a 1000 times ;-) for saving my "beloved and faitfull mg5250 that has served me so many years ... must admit had one other severe problem...had to replace the printer head... probably burn out because of empty ink tank(s)... then i realised that i must check visually that there is ink in all tanks ... the idea is that the program that shows the status of the ink tank will show "empty" tanks "TOO EARLY" rather than "TOO LATE".... there is still ink. although i cannot visually check because the original ink tank is in black plastic... so i bought ink tanks that are translucent, which allows me to see "with my own eyes" that there is ink available before start printing ... i can do that because the printer is on the same desk as the pc ... regards cu :-) ps minimum 10 characters it says :-))