A166USQS7CZDG – Galaxy A16 5G firmware

Build A166USQS7CZDG is a security update for the Galaxy A16 5G (SM-A166U) on Android 16 (One UI 8). It first appeared on Samsung's servers on May 13, 2026 (method) and has reached 9 regions so far. It raises the bootloader bit from 6 to 7: once installed, the device no longer accepts firmware with bit 6 or lower, so a downgrade to A166USQS6CZB6 is blocked. Samsung still serves this file.

Model
SM-A166U
Android
Android 16
Type
Security
Bootloader bit
7
First released
May 13, 2026
Regions
9

Rollout timeline by region

The date each region code (CSC) first received A166USQS7CZDG, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
AIOUSA (Cricket)May 13, 2026day 0A166USQS7CZDG/A166UOYN7CZDG/A166USQS7CZDG
VZWUSA (Verizon)May 13, 2026day 0A166USQS7CZDG/A166UOYN7CZDG/A166USQS7CZDG
CCTUSA (Comcast)May 13, 2026day 0A166USQS7CZDG/A166UOYN7CZDG/A166USQS7CZDG
DSAUSAMay 14, 2026+1 dayA166USQS7CZDG/A166UOYN7CZDG/A166USQS7CZDG
DSHUSAMay 14, 2026+1 dayA166USQS7CZDG/A166UOYN7CZDG/A166USQS7CZDG
TMBUSA (T-Mobile)May 17, 2026+4 daysA166USQS7CZDG/A166UOYN7CZDG/A166USQS7CZDG
TMKUSA (MetroPCS)May 17, 2026+4 daysA166USQS7CZDG/A166UOYN7CZDG/A166USQS7CZDG
USCUSA (US Cellular)May 19, 2026+6 daysA166USQS7CZDG/A166UOYN7CZDG/A166USQS7CZDG
ATTUSA (AT&T)May 25, 2026+12 daysA166USQS7CZDG/A166UOYN7CZDG/A166USQS7CZDG

Download and release notes

samloader download -m SM-A166U -r AIO -v A166USQS7CZDG/A166UOYN7CZDG/A166USQS7CZDG

Samsung's release notes and security patch level for this update: SM-A166U / AIO on doc.samsungmobile.com. What each part of the build number means: decode A166USQS7CZDG.