https://bysmd.com/SMDT2RamdiskActivator.pkg

Apple T2 iMacPro1,1
Apple T2 MacBookPro15,1
Apple T2 MacBookPro15,2
Apple T2 Macmini8,1
Apple T2 MacPro7,1
Apple T2 MacBookPro15,3
Apple T2 MacBookAir8,1
Apple T2 MacBookPro15,4
Apple T2 MacBookAir8,2
Apple T2 MacBookPro16,1
Apple T2 MacBookAir9,1
Apple T2 MacBookPro16,2
Apple T2 iMac20,1
Apple T2 iMac20,2
Apple T2 MacBookPro16,3
Apple T2 MacBookPro16,4

Restore device using Apple Configurator to Globe screen.
Connect to dfu , copy paste serial number ,register and start.

Supported iBridge 9.0+
Full untethered , can update Ota.