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SMLIGHT
Release notes · Jan 17, 2026 · 2 min read

SLZB-OS v3.2.0

We're happy to announce SLZB-OS v3.2.0 — a stability-focused update with new device support, major improvements for U-series USB functionality, and multiple Zigbee Hub reliability enhancements.

Highlights

  • FULL support of SLZB-Ultima addedSLZB-Ultima.
  • Improved USB capabilities for U series (new alternative driver).
  • Better stability during OTA updates and Zigbee Hub operation.
  • Updated dashboard layout.

New Features

  • Added full support for the new SLZB-Ultima deviceLearn more.
  • New alternative USB driver selectable on the "USB" page (U series) — provides advanced USB capabilities.
  • USB passthrough now supports 1200 baud.

Zigbee Hub Improvements

  • Zigbee Hub now includes a Reset option if startup fails.
  • Zigbee Hub now stops automatically when an OTA update is in progress.
  • Added missing Zigbee Hub device configurations after reboot.
  • Fixed a Zigbee Hub crash that could occur in some situations on the U series.

USB & Passthrough

  • Selectable new alternative USB driver on the USB settings page (U series).
  • USB passthrough now supports 1200 baud.
  • Zigbee OTA now works in USB mode on U series devices.

Wi-Fi & Network

  • Wi-Fi connection now checks hidden SSIDs when connecting.
  • Fixed a rare crash when using Wi-Fi in some cases.

OTA & System Stability

  • The reboot confirmation modal now appears only when a reboot is actually required.
  • Dashboard layout updated for improved usability.
  • Fixed WDT (watchdog) triggering during OTA updates in some cases.

Other Fixes and Improvements

  • Fixed Berry VM manager free logic.
  • Fixed language cache issues.
  • Fixed MR3U EFR32 bootloader issues.
  • Fixed wrong IEEE writes after reboot for CC radio modules.
  • SLZB-06Mg26U now uses a separate Zigbee OTA firmware.