This link provides a reset utility and walk through that requires you to change your computer clock BEFORE you unrar the main adjustment program (just read all the txt files at each stage!).
As noted this is UNTESTED but no other waste counter resets currently exist:
http://www.neilandelaines1stopshop.co.uk/
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Printers: (Canon) MP500/830, MX700, iP4000/4200/4300/4500/5200, iX4000(A3) (Epson) C84/86, D88, CX6600, R285/800/1900 (HP) K550, K850, K5400, L7680