A066BXXS8CZI1 – Galaxy A06 5G firmware

Build A066BXXS8CZI1 is a security update for the Galaxy A06 5G (SM-A066B) on Android 16 (One UI 8). It first appeared on Samsung's servers on Sep 23, 2026 (method) and has reached 13 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 A066BXXS7CZF2 is blocked. Samsung still serves this file.

Model
SM-A066B
Android
Android 16
Type
Security
Bootloader bit
8
First released
Sep 23, 2026
Regions
13

Rollout timeline by region

The date each region code (CSC) first received A066BXXS8CZI1, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
INSIndiaSep 23, 2026day 0A066BXXS8CZI1/A066BODM8CZI1/A066BXXS8CZI1
GLBPhilippines (Globe)Sep 28, 2026+5 daysA066BXXS8CZI1/A066BOLM8CZI1/A066BXXS8CZI1
THLThailandSep 28, 2026+5 daysA066BXXS8CZI1/A066BOLM8CZI1/A066BXXS8CZI1
XMEMalaysiaSep 28, 2026+5 daysA066BXXS8CZI1/A066BOLM8CZI1/A066BXXS8CZI1
XNZNew ZealandSep 28, 2026+5 daysA066BXXS8CZI1/A066BOLM8CZI1/A066BXXS8CZI1
XSPSingaporeSep 28, 2026+5 daysA066BXXS8CZI1/A066BOLM8CZI1/A066BXXS8CZI1
XTCPhilippinesSep 28, 2026+5 daysA066BXXS8CZI1/A066BOLM8CZI1/A066BXXS8CZI1
XXVVietnamSep 28, 2026+5 daysA066BXXS8CZI1/A066BOLM8CZI1/A066BXXS8CZI1
XIDIndonesiaSep 28, 2026+5 daysA066BXXS8CZI1/A066BOLM8CZI2/A066BXXS8CZI1
AFRAfricaSep 28, 2026+5 daysA066BXXS8CZI1/A066BOJV8CZI1/A066BXXS8CZI1
DKRSenegalSep 28, 2026+5 daysA066BXXS8CZI1/A066BOJV8CZI1/A066BXXS8CZI1
ECTNigeriaSep 28, 2026+5 daysA066BXXS8CZI1/A066BOJV8CZI1/A066BXXS8CZI1
XFASouth AfricaSep 28, 2026+5 daysA066BXXS8CZI1/A066BOJV8CZI1/A066BXXS8CZI1

Download and release notes

samloader download -m SM-A066B -r INS -v A066BXXS8CZI1/A066BODM8CZI1/A066BXXS8CZI1

Samsung's release notes and security patch level for this update: SM-A066B / INS on doc.samsungmobile.com. What each part of the build number means: decode A066BXXS8CZI1.