Home / Firmware / SM-R866U / XAA
Galaxy Watch FE
R866USQU1BYK6
XAAAndroid 16Released 11/19/2025Firmware details
Key identifiers and package metadata for this release.
R866USQU1BYK6R866UOYM1BYK6 USAUSACSC code XAA5 carriers in 2 countries
CSC stands for Consumer Software Customization (sometimes "Country Sales Code"). Samsung firmware ships with carrier- and region-specific configs; the networks listed below are what this CSC was built to support out of the box.
AT&T310410NWIDNW02171AT&T311180NWIDNW02171AT&T310950NWIDNW02171AT&T310410NWIDNW02172AT&T311180NWIDNW02172AT&T310950NWIDNW02172AT&T310410NWIDNW02088AT&T311180NWIDNW02088AT&T310150NWIDNW00057
AT&T310280NWIDNW02171AT&T310280NWIDNW02172