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Unable to print from a HP Officejet Pro 8600 N911g with its USB cable with HP's Easy Start in macOS.

HP Recommended
OfficeJet Pro 8600 N911g
macOS 10.14 Mojave

Hello.

 

In two MacBook Pros (2012's Mojave v10.14.6 and 2020 Intel's Big Sur v11.1), I downloaded and installed HP Easy Start
(https://ftp.hp.com/pub/softlib/software12/HP_Quick_Start/osx/Applications/HP_Easy_Start.app.zip v2.10.0.201112 / 11/12/2020). However, its USB connection won't print. It can scan, see details, statistics, etc. Why? I had to use its AirPrint to print. Why no USB to print?

 

In Mojave, it shows filter failed and its dmesg shows:
ALF, old data swfs_pid_entry <ptr>, updaterules_msg <ptr>, updaterules_state <ptr>ALF, hash_free: found kext_info <ptr> Library Validation failed: Rejecting '/Library/Printers/hp/PDEs/PDE.plugin/Contents/MacOS/PDE' (Team ID: 6HB5Y2QTA3, platform: no) for process 'TextEdit(1917)' (Team ID: none, platform: yes), reason: mapping process is a platform binary, but mapped file is notStarting poll type 4
Restarting poll type 4
Command 0x1100 completed. inCount: 2 data:0x0Command 0x2 completed. inCount: 2 data:0x6Command 0x1 completed. inCount: 2 data:0x1101Command 0x16 completed. inCount: 2 data:0xc0Command 0xa completed. inCount: 2 data:0xfcaaCommand 0xb completed. inCount: 2 data:0xfcd3Command 0x12 completed. inCount: 2 data:0x14aCommand 0x13 completed. inCount: 2 data:0xffffCommand 0xf completed. inCount: 2 data:0x1179Command 0x10 completed. inCount: 2 data:0x1344SmartBattery: finished polling type 4
/Library/Printers/hp/Frameworks/Matterhorn.framework/Versions/DI_MH.A.06.04.008/Matterhorn: Possible race detected. Rejecting.
Library Validation failed: Rejecting '/Library/Printers/hp/Frameworks/Matterhorn.framework/Versions/DI_MH.A.06.04.008/Matterhorn' (Team ID: none, platform: no) for process 'pdftopdf(2583)' (Team ID: 6HB5Y2QTA3, platform: no), reason: mapped file has no cdhash, completely unsigned? Code has to be at least ad-hoc signed./Library/Printers/hp/Frameworks/Matterhorn.framework/Versions/DI_MH.A.06.04.008/Matterhorn: Possible race detected. Rejecting.
Library Validation failed: Rejecting '/Library/Printers/hp/Frameworks/Matterhorn.framework/Versions/DI_MH.A.06.04.008/Matterhorn' (Team ID: none, platform: no) for process 'pdftopdf(2583)' (Team ID: 6HB5Y2QTA3, platform: no), reason: mapped file has no cdhash, completely unsigned? Code has to be at least ad-hoc signed.filecache_entry_invalidate: invalidating <ptr

 

In Big Sur, it shows lots of "HP Device Monito@: AppleUSBHostUserClient::openGated: could not open provider IOUSBHostInterface. provider already opened for exclusive access by HP Device Monito" lines.

 

I already tried rebooting all machines, uninstalling, and reinstalling HP's softwares and drivers. HP Officejet Pro 8600 N911g's firmware is CKP1CN829AR. When I had the older HP softwares and drivers from 2013, they were fine even though outdated. 😞

 

Thank you for reading and hopefully answering soon. 🙂

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It looks like I am not the only one too according to https://discussions.apple.com/thread/252041404.

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