MacPro 5.1 2010 2012 CPU X5687 & X5698 with New Firmware 144 138?

Hi,

older Firmwares, for some crazy unknown reason did Not recognized those CPUs, X5687 X5698

but No body has done the test again, since 2014 with the Newer Firmwares 138 or 144?

¿Someone knows if Apple eng. team upgraded CPU microcode in the New Firmwares for MacPro5,1 2010 / 2012 ?

or they forgot again?

or there is a technical HW reason it does Not work?

http://blog.greggant.com/posts/2019/10/11/how-to-upgrade-your-mac-pro-firmware-if-stuck.html

https://forums.macrumors.com/threads/mac-pro-cpu-compatibility-list.1954766/

https://forums.macrumors.com/threads/upgrading-my-2009-mac-pro-need-advice.1691581/page-6#post-18710222