Flashing official Samsung firmware on a unlocked carrier phone? Please help!

Hey everyone. I bought a Z flip 4 second hand cause I've always wanted to try one out, having been a fold user for the last few years. I scored a great deal but unfortunatly, the phone I bought is a At&t device. The phone is unlocked, and I'd like to put the official Samsung firmware on it so I don't have the At&t bloatware and boot animation.

The model number is SM-F721U and the current baseband version is F721USQU2CWF1

I've been trying to find the right firmware to flash online, but I'm not having any luck. Can someone point me to the right firmware so I can remove the At&t stuff please? Thanks!