This latest update is the 2nd for the Snapdragon U.S.A. country variants.

The AUC8 update is rolling out for the U.S.A. Snapdragon carrier S21 series models, SM-G99*U, (carrier locked), and SM-99*U1, (carrier unlocked).

It is a big, circa, 1GB download

[UPDATE] Releases so far, as of 13.00 hrs, UTC, 13 April 2021...

U.S. devices, SM-G99*U1 (carrier unlocked)

• Cellular South
• USA (generic) CSC code TMK
• USA (generic) CSC code USC
• USA (generic) CSC code XAA
• USA (generic) CSC code AIO
• AT&T
• Comcast
• Bluegrass Cellular
• Verizon
• T-Mobile (USA)
• Nextech/C-Spire
• Xfinity Mobile
• Sprint (cdma)
• Tracphone

U.S. devices, SM-G99*U (carrier locked)

• Xfinity Mobile
• Comcast
• T-Mobile (USA)
• Sprint (cdma)
• Verizon
• USA CSC code USC

This is the 2nd stable update in 69 days

 

Have updated post #1 with the latest releases, to-date.