Could not read internal BIOS/UEFI FW chip on ASRock B450M Pro4 R2.0

[Jacob G]

Hello - I was told to email by flashrom :)

I tried to read the BIOS chip in my ASRock B450M Pro4 R2.0, with UEFI
firmware version 10.20 (recently released - less than a month old) with
flashrom and it failed:

[nix-shell:~]$ sudo flashrom -p internal -r asrock-b450mpro4-efifw.rom
[sudo] password for jrg:
flashrom v1.3.0 on Linux 6.6.39 (x86_64)
flashrom is free software, get the source code at https://flashrom.org

Using clock_gettime for delay loops (clk_id: 1, resolution: 1ns).
Found chipset "AMD FP4".
Enabling flash write... FCH device found but SMBus revision 0x51 does not
match known values.
Please report this to [e-mail] and include this log and
the output of lspci -nnvx, thanks!.
Could not determine chipset generation.PROBLEMS, continuing anyway
No EEPROM/flash device found.
Note: flashrom can never write if the flash chip isn't found automatically.

Here is your requested information. The output of lspci -nnvx is in the
attached .log file.