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macOS 11.0 Big Sur

Hi, after the Big Sur 11.5.1 update took place, I can't get proper print as letters come out grey squares only. Please see the pic. I had reset printing system for each printer and restart the computer, no change. I've checked the printer driver updates but they are current.  Printers are HP PageWide MFP P57750 and HP PageWide Pro 477dw MFP. Please advice as I can't work like this.

IMG_4351.jpg

 

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