This screen has a new Apple Support URL support.apple.com/mac/restore which will tell you that you need to restore macOS firmware via Apple Configurator 2 and a 2nd mac running 10.15.6 or newer. Restoration will now work the same on the Mac as it does on iOS iPhones and iPads.
iBridge2,1417P6610RestoreBuildVersion17P6610DocumentationURLFirmwareSHA1e9776dda5d2d70e0e0988c18a84b528155b6423bFirmwareURL -http.cdn-apple.com/2020/macos/001-36803-20200810-A97B835C-DB65-11EA-B99D-EC2029ACBA60/iBridge2,1,iBridge2,10,iBridge2,12,iBridge2,14,iBridge2,15,iBridge2,16,iBridge2,19,iBridge2,20,iBridge2,21,iBridge2,22,iBridge2,3,iBridge2,4,iBridge2,5,iBridge2,6,iBridge2,7,iBridge2,8_4.6_17P6610_Restore.ipsw
Apple Configurator 2.3 Dmg
The following Terminal command might provide meaningful output: log stream --debug --predicate '(subsystem == "com.apple.Heimdal") OR (subsystem == "com.apple.AppSSO") OR (subsystem == "org.h5l.gss") OR (subsystem == "com.apple.network") OR (process == "VMware Tunnel") ' 2ff7e9595c
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