Dell R440 server Resizable BAR mod

[westernly]

Hi modders,

I wonder if any of you wizards can help me in any way to add Resizable BAR support to my system. My current firmware is available from Dell here[1].
[1]: https://www.dell.com/support/home/en-us/drivers/driversdetails?driverid=5kdwv

My machine is an R440 server. I've done some research on the topic and it seems to me like this project[2] should have taken care of the difficult part of the task.
[2]: https://github.com/xCuri0/ReBarUEFI

I've tried to follow the instructions given in [2], but when I try to load my BIOS file from Dell (R440-021701C.cap) into UEFITool, it fails with

> FfsParser::parse: not a single Volume Top File is found, the image may be corrupted

so I'm kinda stuck at the modding step in the instructions.

Thanks in advance to anyone willing to help!

Note: I've crossposted this request here as well: https://winraid.level1techs.com/t/reques...-mod/93811