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I had a similar situation with my T430. It can use UEFI with a firmware upgrade but when I got rid of Windows 10 and installed Debian I was back to legacy BIOS and msdos formatting.
I have one laptop that runs Windows 10 with UEFI and I haven't messed with it.
My best desktop is capable of running either UEFI or BIOS and I just stuck with the legacy setup in Linux. I suppose one of these days I'll have to deal with UEFI but so far my stuff is so old it doesn't matter.