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HP OfficeJet Pro 7740 Wide Format All-in-One Printer
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Running MAC sequoia 15.4.1

I need a downgrade link to the 7740 firmware so that i can start to use my printer again! 

Its out of warrenty but now suddenly i am unable to use my own printer inks.
There are loads of work arounds online but none seem to be compatible with MAC.

I am now left unable to print anything at all, i have tried everything. It printed 2 pages then stopped and now i'm left to go to an event with now documents. 

I own this machine i do not lease it so i should be able to put whatever cartridges i please in it. 

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