I have follow the recommendations given in another question having the same situation as mine in this forum:
" "HP cartridges have a warranty that will cover the regionalization reset process even if the printer is not in warranty, see the document here for information. To get warranty coverage you will need to go to the Contact HP page, then enter the information for your printer. At this point it will likely say "Manufacturer's warranty has expired" To the right of this it will say "See details". Click the "See details" link, which will open another page with more details. Near the bottom of the text will be a paragraph that says :
HP has checked your product information, including the product and serial numbers, to determine your warranty results.The legal warranty expiration date is based on the date of purchase, as indicated on your receipt. If you feel these results are incorrect, you may submit a dispute for review.Dispute this>" "
I have done it twice and the response time says 1day but I haven't had the response in my email yet. is there a phone number for HP that you can contact them directly ? please NO virtual agent !!