for my BIOS, i used UEFITool to extract the pcdPeim section from the firmware. in this section i could see the Filename.bin clearly in the hex. in UEFITool you can do a 'search' for the pcdpeim (unicode) and it should show up in the bottom results. the pcdPeim version number of the bios that i have is 4.0... yours is 5.0... and i don't seem to see anything legible for filename... perhaps you can try any filename? or the recovery isn't coded?? good luck
Code: 4FDA3A9B56AE244C8DEAF03B7558AE50 75AA0600921400F8940000193C197D3C 2C68144CA68F552DEA4F437E05000000 900000001E0000004800000040000000 7000000088000000890000008D000000 000000000A000000010000DA00000000 00000000900000049400000498000004 9C000004AC000001A0000004A4000004 AD000001A8000002AA00000200000000 00000000000000000000000000000000 0000000000000000000100DA1600001B 02254DF301E24DAD233FF336353FF323 F1080000AC130012565A4C01020BC001 980300002002000018ADE5FF00000000 A0140000A00000000000000000000000 2E746578740000007512000020020000 80120000200200000000000000000000 00000000200000682E72656C6F630000 A0000000A0140000A0000000A0140000 00000000000000000000000040000042 00000000000000000000000000000000 4FDA3A9B56AE244C8DEAF03B7558AE50 926D29EA690B3C428C2833B4E0A91268 F56EB82AB5EC3441B5563854CA1FE1B4 581CE806D74ABC448390F10265F72480 254DF301E24DAD233FF336353FF323F1 5B158B4D59C08F4C892606FD4331DB8A 596B0CA659E45D429C690BCC9CB27D81 11B1E5FF46B1E5FF56B1E5FF67B1E5FF 77B1E5FF8CB1E5FF46B1E5FF9AB1E5FF 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Found this in another section of the file: - 4E0065007700460069006C0065002500 64002E00620069006E00000000000000 4E0065007700460069006C0065002E00 620069006E This translates to NewFile.bin - Maybe unrelated, but it's my best match so far! I've searched for .bin, .rom and .fd - and that's the only match.