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

[antdude]

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. 🙂

[antdude]

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