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Hi, first post here - actually made an account just to answer to that. Many, many thanks for these instructions! 😊 Turns out this also works for a Pixma iP7250 (550/551 cartridges), at exactly the same addresses (0x2a, 0x102a). Its flash chip is a GD25Q32BSIG (3.3V, 4MB). I figured it out the...