user@debian:/mnt$ sudo flashrom -w apu4_v4.16.0.1.rom -p internal:boardmismatch=force
flashrom v1.2 on Linux 5.10.0-10-amd64 (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).
coreboot table found at 0xdfec3000.
Found chipset "AMD FCH".
Enabling flash write... OK.
Found Winbond flash chip "W25Q64.V" (8192 kB, SPI) mapped at physical address 0x00000000ff800000.
This coreboot image (PC Engines:apu4) does not appear to
be correct for the detected mainboard (PC Engines:apu2).
Proceeding anyway because user forced us to.
Reading old flash chip contents... done.
Erasing and writing flash chip... Erase/write done.
Verifying flash... FAILED at 0x00245001! Expected=0x41, Found=0xff, failed byte count from 0x00000000-0x007fffff: 0x291
Your flash chip is in an unknown state.
Get help on IRC at chat.freenode.net (channel #flashrom) or
mail [email protected] with the subject "FAILED: <your board name>"!
-------------------------------------------------------------------------------
DO NOT REBOOT OR POWEROFF!