A266USQS8BZD4 – Galaxy A26 5G firmware
Build A266USQS8BZD4 is a security update for the Galaxy A26 5G (SM-A266U)
on Android 16 (One UI 8). It first appeared on Samsung's servers on Apr 29, 2026 (method) and has reached
2 regions so far. It raises the bootloader bit from 7 to 8: once installed, the device no longer accepts firmware with bit 7 or lower, so a downgrade to A266USQS7BZB6 is blocked. Samsung still serves this file.
- Model
- SM-A266U
- Android
- Android 16
- Type
- Security
- Bootloader bit
- 8
- First released
- Apr 29, 2026
- Regions
- 2
Rollout timeline by region
The date each region code (CSC) first received A266USQS8BZD4, counted from the first release.
| CSC | Region | Released | Rollout | Version (PDA/CSC/MODEM) |
|---|---|---|---|---|
CCT | USA (Comcast) | Apr 29, 2026 | day 0 | A266USQS8BZD4/A266UOYN8BZD4/A266USQS8BZD4 |
USC | USA (US Cellular) | May 5, 2026 | +6 days | A266USQS8BZD4/A266UOYN8BZD4/A266USQS8BZD4 |
Download and release notes
samloader download -m SM-A266U -r CCT -v A266USQS8BZD4/A266UOYN8BZD4/A266USQS8BZD4Samsung's release notes and security patch level for this update: SM-A266U / CCT on doc.samsungmobile.com. What each part of the build number means: decode A266USQS8BZD4.