An alternative method to Enabling hidden 4G decoding is by using AMIBCP (Aptio IV, typically from before ~2016) or UEFI-Editor (Aptio V, AMIBCP will give error on these) to enable access to the hidden menu. This method is not recommended as it requires modifications to the BIOS file and can result in boot failure if done incorrectly. This method also won't work on any non-Aptio BIOS such as prebuilts.

• Locate the hidden menu with 4G Decoding.

• Change Access to USER.

• File -> Save to save the modified BIOS.

TODO, usually these will already have the 4G decoding option exposed.

See [TOOL] UEFI Editor for more information.