F971U1UEU3AZI5 – Galaxy Z Fold8 firmware

Build F971U1UEU3AZI5 is a feature update for the Galaxy Z Fold8 (SM-F971U1) on Android 17 (One UI 9). It first appeared on Samsung's servers on Sep 14, 2026 (method) and has reached 13 regions so far. It raises the bootloader bit from 2 to 3: once installed, the device no longer accepts firmware with bit 2 or lower, so a downgrade to F971U1UES2AZH7 is blocked. Samsung still serves this file.

Model
SM-F971U1
Android
Android 17
Type
Feature
Bootloader bit
3
First released
Sep 14, 2026
Regions
13

Rollout timeline by region

The date each region code (CSC) first received F971U1UEU3AZI5, counted from the first release.

CSCRegionReleasedRolloutVersion (PDA/CSC/MODEM)
ACGUSA (C Spire)Sep 14, 2026day 0F971U1UEU3AZI5/F971U1OYM3AZI5/F971U1UEU3AZI5
CCTUSA (Comcast)Sep 14, 2026day 0F971U1UEU3AZI5/F971U1OYM3AZI5/F971U1UEU3AZI5
DSAUSASep 14, 2026day 0F971U1UEU3AZI5/F971U1OYM3AZI5/F971U1UEU3AZI5
DSHUSASep 14, 2026day 0F971U1UEU3AZI5/F971U1OYM3AZI5/F971U1UEU3AZI5
LRAUSA (Bluegrass)Sep 14, 2026day 0F971U1UEU3AZI5/F971U1OYM3AZI5/F971U1UEU3AZI5
TFNUSA (TracFone)Sep 14, 2026day 0F971U1UEU3AZI5/F971U1OYM3AZI5/F971U1UEU3AZI5
TMBUSA (T-Mobile)Sep 14, 2026day 0F971U1UEU3AZI5/F971U1OYM3AZI5/F971U1UEU3AZI5
TMKUSA (MetroPCS)Sep 14, 2026day 0F971U1UEU3AZI5/F971U1OYM3AZI5/F971U1UEU3AZI5
VZWUSA (Verizon)Sep 14, 2026day 0F971U1UEU3AZI5/F971U1OYM3AZI5/F971U1UEU3AZI5
XAAUSA (unlocked)Sep 14, 2026day 0F971U1UEU3AZI5/F971U1OYM3AZI5/F971U1UEU3AZI5
XARUSA (Cellular South)Sep 16, 2026+2 daysF971U1UEU3AZI5/F971U1OYM3AZI5/F971U1UEU3AZI5
AIOUSA (Cricket)Sep 16, 2026+2 daysF971U1UEU3AZI5/F971U1OYM3AZI5/F971U1UEU3AZI5
ATTUSA (AT&T)Sep 16, 2026+2 daysF971U1UEU3AZI5/F971U1OYM3AZI5/F971U1UEU3AZI5

Download and release notes

samloader download -m SM-F971U1 -r XAA -v F971U1UEU3AZI5/F971U1OYM3AZI5/F971U1UEU3AZI5

Samsung's release notes and security patch level for this update: SM-F971U1 / XAA on doc.samsungmobile.com. What each part of the build number means: decode F971U1UEU3AZI5.