Acer Aspire 7750G Restart Loop after changing settings

[DrAether]

Hello!
I tried to change the switchable graphics setting in my bios, because the AMD grphics card is defective (So that the laptop only uses the intel internal graphic. But after changing the switchable graphics settings, it only goes into a restart loop. The intel insyde recovery mode doesnt work, I waited over an hour, but only the fans are on. I tried several usb ports and sticks but it doesnt work. I used an official .fb file from acer and put it in the root of my fat32 formated usb. But it still isnt working.
Do you have any idea how to solve this issue? If not, it is ok. Because of the defective AMD the screen is only working over vga, sometimes glitching (before the bios thingy)

[DrAether]

Small Update!
After keeping out the cmos battery, the laptop stays on after starting, wich is good. I think?
But what now?
Before, I could see the bios over the vga port, but now, nothing...
Any ideas?

[Maxinator500]

I used an official .fb file

But didn't rename it correctly?

[DrAether]

I renamed it correctly.
I used Phoenix Tool.
It said Recovery filenames are:
P5WE0X64.f?
I assumed, the f? is .fb

[Maxinator500]

the f? is .fb

I hope you mean ".fd".

[DrAether]

Oh sorry, I meant .fd ^^