I have been beating on an M1 MacBook Air in an attempt to issue an unattended macOS software update from 11.3 to 11.3.1 and I believe I have it working.
I crafted a very rough API script that issues the ScheduleOSupdate command and once I ran it on the M1, it showed in Jamf that the MDM command was in fact pending and eventually reported successful, but I saw no indication on the Mac itself that anything occurred or that the update was even downloading. I left it alone for toughly 7 minutes when all of the sudden it just restarted and did perform the update. I was never prompted to enter a password, it simply restarted and forced closed all apps open.
The only issue is that I was logged in at the time so I cannot confirm if this will work at the login screen. I have pasted the script I ran in here so if someone else wants to give it a try please do. Maybe it was a fluke.
#!/bin/sh
#API login info
temp_nu="Temp Username"
apiuser=$(echo $temp_nu | openssl base64 -d)
temp_np="Temp Password"
apipass=$(echo $temp_np | openssl base64 -d)
jamfProURL="https://ORG.jamfcloud.com"
#Grab serial number and OS Version of computer
SerialNumber=$(system_profiler SPHardwareDataType | grep 'Serial Number (system)' | awk '{print $NF}')
macOSVersion=$(sw_vers -productVersion)
#Check macOS Major
CheckIt=$(echo $macOSVersion | cut -d . -f 1)
#Set xpath option based on macOS major version
if [[ "$CheckIt" == "11" ]]
then
xpath="xpath -e"
else
xpath="xpath"
fi
jamfProCompID=$( /usr/bin/curl -s -u ${apiuser}:${apipass} ${jamfProURL}/JSSResource/computers/serialnumber/${SerialNumber}/subset/general | $xpath "/computer/general/id/text()" )
echo $jamfProCompID
#/usr/bin/curl -s -X POST -H "Content-Type: text/xml" -u ${apiuser}:${apipass} ${jamfProURL}/JSSResource/computercommands/command/ScheduleOSUpdate/action/InstallForceRestart/id/${jamfProCompID}
#/usr/bin/curl -s -X POST -H "Content-Type: text/xml" -u ${apiuser}:${apipass} ${jamfProURL}/JSSResource/computercommands/command/ScheduleOSUpdate/action/Default/id/${jamfProCompID}
/usr/bin/curl -s -X POST -H "Content-Type: text/xml" -u ${apiuser}:${apipass} ${jamfProURL}/JSSResource/computercommands/command/ScheduleOSUpdate/action/install/id/${jamfProCompID}
exit 0
