Dell 5575 Insyde Bios Modd. Invalid Firmware image error

Hello, after try to edit Dell Inspirion 5575 Bios with Inside H2OUVE tool, i got this error when i try to install : ‘‘Invalid Firmware image’’; i think that, the bios original image has signed, and when i edit, the md5 of files change and don’t correspond with sign information.
----Details
I have dell 5575, and i really work to try to edit the bios, but the original bios file is signed, any modification as change file sha256, and bios report when i try to install : ‘‘invalid firmware image’’. On the internet i found other user fix this problem with HxD tool. But me… i am fail. On this link we can download:
- Dell original bios file
-(Dell original bios file) edited for allow 2gb of VRAM
-Bios on-windows backup and edited version for 2gb of VRAM.
----- The AMD CBS menu help to edit Gfx configuration and change VRAM option; but …
https://mega.nz/#!RhAHGCJS!_GfA87S6L517I…98lVM_u4a6QAerw