I've recently purchased new 951XL cartridges for my HP Officejet Pro 3600 Plus. The new color cartridges (3) are Z10's and the old were Z20's. going thru all the recent issues with the regionalization, looks like I need a regionalization reset. I assume the current 950XL Z20 black cartridge is also going to have to be replaced even though it's 3/4 full. Can you please send me the reset instructions.
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