Any "rogue" firmware modified by 3rd party can never be trusted.
Sounds like FUD to me. The original firmware can be trusted even less as it includes the wireless firmware whitelist antifeature. If I understand correctly the 3rd party BIOS images are made by disassembling the stock BIOSes so their security should be comparable. Unless of course you can prove that the developers of these BIOSes inserted rogue code your claim seems devoid of merit.
