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Message: [QUOTE="Gogs, post: 219310, member: 17811"] So I think I solved this problem. Does not seem connected to firmware after all. When checking the chip of the toner cartridge (small chip on the top left as it goes into the printer, which will make contact to four pins as the cartridge docks into place), I saw there is something underneath it. The chip card is sitting only with some double adhesive and can be lifted up rather easily, so you actually release the chip from the cartridge. Look under it - there is a battery sitting there. It's a very small 1.5 V battery. My original battery was a "Vinnic L521F". So I thought, what if I just replace the battery? Did not find the exact same brand, but a GP watch battery type SR63. Same physical dimensions and same voltage. I placed the new battery in the holder and then pressed the chip back into place. First attempt it didn't work actually but after opening the printer once more and yanking the cartridge a little (nothing much, just press a few times back and forth just where it is in its place), it now works like a charm! I attach two pictures. [ATTACH type="full" alt="989f763d-2a0e-44f0-8e15-8ff5bf69fe88.jpg"]2195[/ATTACH] [ATTACH type="full" alt="80d7e62f-a3d3-43c0-9e35-5f17b4fb4fa6.jpg"]2196[/ATTACH] [/QUOTE]