Error 451: The host CPU does not have write access to the target flash area.

BIOS/UEFI Modding BIOS Modding Guides and Problems
1

Hello, I am trying to flash the modified bios that I have but I get the title error. Well if anyone can help me very grateful in advance.

Best regards.

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C:\Users\*\Downloads\WIN64>fpt -d backup.bin
 
Intel (R) Flash Programming Tool. Version:  11.8.60.3561
Copyright (c) 2007 - 2018, Intel Corporation. All rights reserved.
 
Reading HSFSTS register... Flash Descriptor: Valid
 
    --- Flash Devices Found ---
    MX25L6473E    ID:0xC22017    Size: 8192KB (65536Kb)
 

 
Error 318: The host CPU does not have read access to the target flash area. To enable read access for this operation you must modify the descriptor settings to give host access to this region.
FPT Operation Failed.
 

C:\Users\*\Downloads\WIN64>fptw64 -rewrite -f H11MHDV37.40.CFL.bin
 
Intel (R) Flash Programming Tool. Version:  11.8.60.3561
Copyright (c) 2007 - 2018, Intel Corporation. All rights reserved.
 
Reading HSFSTS register... Flash Descriptor: Valid
 
    --- Flash Devices Found ---
    MX25L6473E    ID:0xC22017    Size: 8192KB (65536Kb)
 
Unable to detect ME disabled.
Do you wish to proceed with the flash write operation? Y/<N> or q to quit : y
 
GbE Region does not exist.
 
Error 451: The host CPU does not have write access to the target flash area.  To enable write access for this operation you must modify the descriptor settings to give host access to this region.
FPT Operation Failed.
 
2

@Virus - Be careful! Do not use -rewrite unless you are 100% sure file is OK (ie tested previously) and that you already know can write the area (in this case area = entire BIOS, not usually possible unless you unlocked FD first)!
So, DO NOT reboot, you’ve probably erased the BIOS chip totally now since you did not choose a region, unless you got lucky

Dump all the following and do not reboot yet!
FPTw.exe -desc -d fd.bin
FPTw.exe -me -d me.bin << This may error, AND this (due to above), is why you can’t do full BIOS write, Asrock usually locks FD and ME region from write (ie you need flash programmer, or to do pinmod, if S3 sleep bug is not present in this BIOS)
FPTw.exe -gbe -d gbe.bin << if no GbE then error, it’s OK, onto next
FPTw.exe -bios -d biosreg.bin

Send me FD.bin, then check each file created from above in hex editor, if not empty (100% FF) then safe to reboot. If all 100% empty, then DO NOT REBOOT and I will try to help you fix without bricking.