Latest ASUS Bioses using Encrypted Configuration menus? want to unlock Re-Size Bar "enabled" option on B550-F Gaming

Ive got a 3900XT and a 3080 running on my Strix B550-F Gaming motherboard. I had heard that some bioses for other ASUS boards allowed the RE-SIZE BAR SUPPORT option to be enabled on older (non 5000 series) CPUs.

I updated my bios to the latest version and did find that Re-Size BAR Support is listed after enable above 4G Decoding in PCI Subsystem settings, however the only options i can pick on this bios are “Disabled” and "Auto"
I switched it to Auto and updated my GPU drivers, but i am not getting re-size bar support.

Due to this, I assume that the “Auto” setting must check for the presence of the required hardware for AMD’s “SAM Technology” (eg a 5000 series cpu and 6000 series GPU)
I imagine that there is probably a “enabled” option which might override that which may be hidden from access.

I attempted to open the BIOS file i flashed my pc with with all available versions of AMIBCP that i can find, but unlike older BIOS files, the “Setup Configuration” and “BIOS Strings” Tabs are not shown on this bios.

Since AMIBCP are still opening the file that must mean that it is still of Aptio IV/V format, but that these files are no longer Plain-text for stock/old AMIBCP to read?

Are there any newer versions of AMIBCP that can read these or is there some way to decrypt and edit them manually?

Bios is AMI Aptio V, not 4

0x4A5BE Suppress If {0A 82}
0x4A5C0 QuestionId: 0x185 equals value 0x0 {12 06 85 01 00 00}
0x4A5C6 Gray Out If {19 82}
0x4A5C8 QuestionId: 0x2DF equals value 0x1 {12 06 DF 02 01 00}
0x4A5CE One Of: Re-Size BAR Support, VarStoreInfo (VarOffset/VarName): 0x1B8, VarStore: 0x1, QuestionId: 0x186, Size: 1, Min: 0x0, Max 0x1, Step: 0x0 {05 91 72 04 73 04 86 01 01 00 B8 01 10 10 00 01 00}
0x4A5DF One Of Option: Disabled, Value (8 bit): 0x0 {09 07 04 00 00 00 00}
0x4A5E6 One Of Option: Auto, Value (8 bit): 0x1 {09 07 05 00 00 00 01}
0x4A5ED Default: DefaultId: 0x0, Value (8 bit): 0x0 {5B 06 00 00 00 00}
0x4A5F3 Default: DefaultId: 0x1, Value (8 bit): 0x0 {5B 06 01 00 00 00}
0x4A5F9 End One Of {29 02}
0x4A5FB End If {29 02}
0x4A5FD End If {29 02}

I hope AMD extend this support to other devices, since intel/nvidia announced that they would support it as well.
I imagine it could be quite a helpful feature for games/workloads that require moving lots of assets/data in and out of VRAM regularly.
Maybe someone can figure out how to force enable the feature?

I wasnt sure which version of Aptio the bios was since both versions of AMIBCP open the file and some other bios can only be opened by one or the other…