Hi ,
Let me fist inform you that the question you asked for is related to "regionalization" of the printers . It is very particular to HP printers.
You can just regionalize your printer thrice in the enitre printer lifetime - not more than that. And the codes you are referring to - they are not there somewhere - they have to be logged in by the back end team who decode the "10-tap test" to re-enter the codes for regionalization so that the printer becomes compatible in the region you are using it in.
The cartridges even change in every country to make the printer work - let me state you how.....as per
www.hp.com
HP Photosmart C3100 All-in-One series
This product uses regionalized ink supplies, so the inkjet print cartridges for the product depends on where you are in the world.
If you do not know which pen regionalization zone you are in,
click here to view the Regionalization Country-to-Zone Mapping Table . Once you know the zone, you can identify the cartridges used in this product.
Cartridge Description
Zone 1
Zone 2
Zone 3
Zone 4
black inkjet print cartridge
HP 92
HP 336
HP 132
HP 850
tri-color inkjet print cartridge
HP 93
HP 342
HP 136
HP 854
black inkjet print cartridge
Not availaible
HP 338
HP 131
Not available
tri-color inkjet print cartridge
HP 95*
HP 343
HP 135
HP 855
photo inkjet print cartridge
HP 99
HP 348
HP 138
HP 858
*The HP 95 is not compatible with printers sold only in North America; instead, use the HP 93 Tri-color cartridge.
Refer to the link to understand how the world is divided into 4 zones -
http://h10025.www1.hp.com/ewfrf/wc/document?docname=bpa00586&cc=us&lc=en&dlc=en&product=1146331#zone_mapping
And you can beleive into what i say as I work for HP printers....!
the best i would suggest is to call up Technical / Customer Care centre and tell them you need to reset....they will assist you for 10-tap test and ask you to send them the 10-tap test and the Proof of Purchase of the region cartridges.....and then wait for the back end team to call you within the next 48 hours.
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