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‎06-13-2019 08:56 AM - edited ‎06-13-2019 08:58 AM

HP Recommended
Product: HP Officejet 7740
Operating System: Microsoft Windows 10 (64-bit)

Hi guys we have a big problem.

Have bought 11cartridges for hp 7740 but is impossible use it after the upgrade of firmware 16.04.2019 number 1912A.

So we cant use old toner.

Can downgrade the firmware? how can use it?!?!?

help please

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