Many thanks.
The set that's currently run out is 221. From reading your post I could use those, assuming I get a chip resetter? Literaly just cut them off and stick them over the 521 ones?
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Thanks guys. Prior to this I'd never heard of ink cartridge regionisation. Bloody nuisance. If I wasn't intending to print photos I'd start using cheaper non-Canon ink.
@spiderman: Can you point me to something that tells me about replacing the chips?
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I bought a whole stack of 521 ink for my new ip4600 printer based on what was on Canon (uk)'s webpage, but it seems my printer wants the 221 varient.
Is there any known way to persuade the printer to use what its given?
i