iMac19.1 model (2019 iMac 27″) lacks a T2 security chip and, when using this SMBIOS model, you receive update notifications.Regarding the updates that are notified in Software Update and the size of the update (full or incremental package), there are some conditions to take into account. There are 3 SMBIOS that I can use on my PC: iMac19,1 / iMacPro1,1 / MacPro7,1. UEFI > Quirks: EnableVectorAcceleration and RequestBootVarRouting = True.UpdateDataHub, UpdateNVRAM and UpdateSMBIOS = True.Misc > Security: AllowSetDefault=True, BlacklistAppleUpdate=True, ExposeSensitiveData=6, SecureBootModel=x86legacy or Default.Misc > Debug: AppleDebug, ApplePanic and DisableWatchDog = True, Target=3.Misc > Boot: HibernateMode=None, PickerAttributes=144, PickerVariant=Default, ShowPicker=True.Kernel > Quirks: SetApfsTrimTimeout = 0.Kernel > Quirks: CustomSMBIOSGuid, DisableIoMapper, DisableIoMapperMapping, DisableLinkeditJettison, PanicNoKextDump and PowerTimeoutKernelPanic = True.Kernel > Add: Sonoma compatible kexts, Lilu.kext in the first place, UTBMap.kext specific for this motherboard.Booter > Quirks: AvoidRuntimeDefrag, DevirtualiseMmio, ProtectUefiServices, ProvideCustomSlide, RebuildAppleMemoryMap, SetupVirtualMap and SyncRuntimePermissions = True.SSDT-AWAC.aml is not required on my system but, if in doubt, add it because it does not cause any harm if it is present without being needed ACPI: SSDT-EC-USBX.aml, SSDT-PLUG.aml and SSDT-PMC.aml.These are the main details when configuring ist. I get best results with iMac19.1 SMBIOS and the iGPU enabled in BIOS. Note: in last versions of Ventura, sudo spctl –master-enable (or disable) has been replaced by sudo spctl –global-enable (or disable). These security options can be changed after installation as they are not required out of updating macOS. It is advisable to have Gatekeeper enabled ( sudo spctl –master-enable in Terminal).
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