SM-X840 firmware

Stock firmware and official updates for the Samsung Galaxy Tab S12+ (SM-X840), by region.

Software support

Security updates untilSep 30, 2033As published by Samsung

Latest firmwareAndroid 17X840ZCU1AZH3 · built Aug 11, 2026

RegionBuildAndroidSecurity patchDateDetails

Canada XACBuildX840XXU1AZH3AndroidAndroid 17Security patch—BuiltAug 10, 2026DetailsDownload

China CHNBuild

Builds in our firmware catalog, newest first.

BuildAndroidBuiltRegions

X840ZCU1AZH3AndroidAndroid 17BuiltAug 11, 2026Regions1 CSC

X840XXU1AZH3AndroidAndroid 17BuiltAug 10, 2026Regions17 CSCs

Display size: 320.4mm (12.6" full rectangle) / 317.8mm (12.5" rounded corners)
Resolution: 2800 x 1752 (WQXGA+)
Display type: Dynamic AMOLED 2X