Hello and Welcome to EliteMacx86!
As per the specs in your profile, you should have no problem updating it to Big Sur. Can you explain what issue are you encountering?
Your EFI is not as per the guide. You don't need SSDT-PMC.aml.
Why are you injecting SSDT-SBUS-MCHC and then also renaming MC to MCHC?
Why are you using CPUFriendDataProvider and then also injecting vectors via the SSDT-CPUF?
Your board has only Realtek NIC. Then why are you injecting...
HD 3000 has a native support on High Sierra and rest should be functional as well. You don't need the IO8021HighSierra. Also, before you upgrade, ensure you have a sufficient backup.
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