I have a .fd file but no idea where I got it or even if it's for Ranger. Use at your own peril.
https://www.udrop.com/ONt9/VAS00X64.rar
My notes say you got the insyderflash.exe from DELL, open it and without closing it goto your C:\windows\temp folder and copy VASxxx.fd file. Put that .fd file onto the root of a FAT32 usb stick (follow the rest of the guide)
Trouble is I cannot find an insyderflash bios update for Ranger.
You can try find the official bios files here
https://www.dell.com/support/product-details/en-au/product/alienware-17/drivers
Dont click on download, click where is says Alienware 17 system bios, then at bottom of side screen click All driver versions.