Forgot to add:
1) Let me know if you are still willing/able to host these files so I can update the links
2) Keep us updated, let us know if you find anything interesting!
Ideally the end result would be an open-source firmware for the device.
That could end up unlocking a lot of features that are hardware-supported but software-restricted (to more expensive models, perhaps).
Similar to what the CHDK firmware does for Canon PowerShot cameras. It unlocks a lot of...
This may not be the best place to post this but I'm not sure where else it would fit.
So I started to hack around with my MG5220 a bit.
I downloaded the service manual:
http://www.4shared.com/office/HEzwqoJT/canon_pixma-mg5220_sm.html
I found a 64-mbit ROM chip (MX23L6454), desoldered it and...