asus vivobook s15 secured flash failed

hi, i want to unlock some feautures on bios and i did following your guide using aptio tools. i did all the necessary steps but while flashing it gives me secured flash failed error. its an aptio v bios.
tried using /GAN method with all AFU versions and AFUWIN tools but it gives me the same error.
However if i try to flash it with AFUDOS v5 it shows flash complete but the bios settings are not changed.
Its an asus vivobook s15 s510un notebook pc.
uploading link to modded bios.…iew?usp=sharing
any help would be appreciated.