As with many things, "It's complicated" but effectively, yes
Such system firmware is generally provided by AMI / Insyde / Phoenix and similar.
There are a few vendors who decide to go their own way (notably google using a fork of Coreboot for their chromebooks), but it's generally list of vendors that you can count on a single hand.
If it means anything I'm pretty sure AMI provides A/B updates on most products i've used with their stuff.
Such system firmware is generally provided by AMI / Insyde / Phoenix and similar.
There are a few vendors who decide to go their own way (notably google using a fork of Coreboot for their chromebooks), but it's generally list of vendors that you can count on a single hand.
If it means anything I'm pretty sure AMI provides A/B updates on most products i've used with their stuff.