probleme with v3-771G bios not unlocked

hi guys
i update my bios of aspire V3-771g with v 2.28 unlock privide on this website, and i got a probleme , my labtop still showing ""No bootable devies. hit any key""

i flash with esc+fn with files VAG70X64.fd on usb ,

how can i backup my bios ?
when i download v 2.28 on acer website , the file is not the same i got bin file not a fd

thanks guys