Have I understood that correctly? The current BIOS MOD version 3802 of the TUF B450M-PLUS GAMING has been equipped with the new components that are currently available in UBU, namely the following:
- EFI AMD RAIDXpert2-Fxx
- EFI AMD GOP Driver
- OROM VBIOS
- EFI Realtek UNDI Driver
- OROM Realtek Boot Agent GE
- CPU Microcodes
The AGESA module cannot be replaced as a whole?
According to Asus, the AGESA module V2 PI 1.2.0.7 is currently in BIOS version 3802. If an exchange were somehow possible, you could create a second updated BIOS MOD (3802) with the AGESA module from BIOS version 1804 (Agesa 1.0.0.3 Patch AB).
If that is not possible, a completely updated BIOS 1804 with the latest versions of all firmwares and microcodes could be created.
EDIT: Unfortunately I don’t have any documentation on how to enable PCIe 4.0. You probably need to know where in the AGESA module this needs to be activated.