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So, it's likely, on balance, that the newer service tool is the one to get so long as it's a genuine release and not someone getting cute with malware... The bit you @PeterBJ, mentioned about changing the hardware seems to be key to keeping it functioning though. Any change and the app won't...

If you have some old refillable cartridges those use the 4mm plugs you need. I'm guessing you're in the US given the imperial measurement or I'd say I've got them on OctoInkjet too.

*dusts off account and taps the mic'*... "Hello? ... Hello?... Is this thing on?..." Yes, dear folks I have returned from fighting demons**, climbing great heights and smiting the evil doers who brought us Brexit and Aunt Bessies frozen yorkshire puddings (Heretics all!) and I seek your help...

Well, he could ... just sharing that 7zip is a really useful utility for decompressing a lot of different compression file formats... Winzip is the devil incarnate though... Evil, nasty developerssssss. We hatez them don't we preccioussss ;)

You can open it with 7zip.

For legal purposes this should not be taken as advice on how to affect a change in marital status or similar.

Could be a few things... I'm busy finishing a video that's aimed specifically at troubleshooting Ecotank printers but due to technical issues I need to reshoot some of the footage and then edit the whole thing so it's going to be a week or so before it's done but don't throw the printer out just...

Oof! If it was second hand and I'm guessing has had some moving around it may have had ink or similar that shorted out some of the electronics. That's gotta hurt though. Hope it wasn't too expensive.

Actually just checked and the WICReset app also supports the TS5000 series so it should be able to do what you need as an alternative to the Canon service tool. You'll need to purchase a WICReset key though. The instructions @PeterBJ provided for getting it into service mode still apply though.

Can provide a little insight in this. For now at least, most maintenance box units seem to have a respective resetter.

No idea but I can't see myself punting that amount of cash to find out it's just a "refer to Canon head office" :smack

FWIW: if you can get hold of older firmware updates that don't have the third party crippling function you can extra the necessary file to a memory stick and use that to revert your firmware to an older version. https://support.printerpotty.com/2022/hp-firmware-downgrade

As waste ink is my bag I can tell you that your caution is well advised... The ET-8550 is supported for it's main waste ink output by the maintenance box that you can change out yourself... BUT, the platen waste ink pad (and counter) are locked away from the end-user and cannot be reset. Now...

So... just wondering... Has a replacement parts supplier been appointed for the UK?

They're considerably bigger now but still full of all sorts of mischief ;) Odd that it's falling between the cracks but the follow on suggestions from other members cover the bases I would have suggested (and then some) so hopefully you'll find something in those that works. Keep us posted...