flashing efi

Graphics card upgrade K200M for iMac 2010 21 inch failed on flashing with USB Ubuntu live boot ,the error getting was I/O ERROR: cannot open file.Saved rom for current vbios was 156KB,while the new vbios file was (K2100.rom ) was 256KB, don,t know this issue was higher 256KB bios needed or...

iMAC A1311 21.5" Mid 2010 Logic Board Motherboard 820-2784-A gpu was failed already having Quadra K2000M, from dell precision ,how to flash vbos for K2000M on Imac directly for boot screen ,possible to flash with bootable ubuntu linux ,from the macrumors thread K2000M was supporting mojave...

Am having EVGA GTX 960 SSC using for windows PC ,can be able to flash for MacPro 5.1,Please guide how to EFI flash GTX model,there was any definitive guide for Flashing EFI Flashing same EFI rom can be used for all same category for GTX model example EVGA GTX 960 SSC 2GB ,same EFI rom can be...

Hey, i figured out in another thread, that my mac pro 4.1(patched to 5.1) has a EFI based booting problem. Now my hope is to get it back working with an older OS X el capitan version as a boot stick, original cpu etc. and a corresponding flashed EFI Chip ( seen in this thread ). I also saw...