Hello, first of all, all firmware updates offered by dell are working only on cards manufactured for dell ( or hdd/ssd sold as dell parts ). For cards manufactured by others, either check if the maker has some update or if nvidia has something directly available. Secondly, the bios of the computer must also support resizable bar, and as far as I know, is not an option offered in the 5820/7820/7920 bios
 Hello! I have Dell T5820 XL Tower and RTX 3080 Ti. I can't enable Resizable BAR for GPU because no option for that in MBO BIOS. Can DELL  make some new BIOS with this option?
Resizable BAR