About flash a Unknown (XAA) firmware - Samsung Galaxy S21 Questions

Hello.
I have a Samsung Galaxy S21 5G (SM-G991U) Verizon.
I was wondering if I can I flash a Unknown Firmware over Stock Verizon Firmware.
I want to flash SM-G991U1 Unknown (XAA) firmware over SM-G991U USA (Verizon ) (VZW) Firmware.
It is possible?
THANKS!

G991U and G991U1 Firmware Links and Flashing Discussion Here

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