This is AMI Aptio V core bios, the /GAN wont work here, very very few accept it, the /GAN is used in AMI Aptio IV core bios.
Options…AIsuite method, FPT tool method (Needs bios regions access) or CH341.
Also, AMIBCP may not reflect the changes in Aptio V as it was in Aptio IV as new bios needs additional changes in AMISETUPdata module.
The alternative tool is UEFI editor.
EDIT: Sorry i dont mod laptop bios. The AMISETUPdata is not to replaced its to edit, look in forum for other users same issue.