--- title: "E21 V3.0 Firmware" slug: "e21-v30-firmware" status: "update" updated: 2026-10-26T07:24:07Z published: 2026-10-26T07:24:07Z canonical: "knowledge.akuvox.com/e21-v30-firmware" --- > ## Documentation Index > Fetch the complete documentation index at: https://knowledge.akuvox.com/llms.txt > Use this file to discover all available pages before exploring further. # E21 V3.0 Firmware [E21 LTS Firmware V3.0 (Click to download)](https://maintenance.akuvox.com/firmware/release/lts?model_name=E21SV823) **Version:** 321.30.10.10 [E21 Release Firmware V3.0 (Click to download)](https://maintenance.akuvox.com/firmware/release/stable?model_name=E21SV823) **Version:** 321.30.10.31 [E21 Beta Firmware V3.0 (Click to download)](https://maintenance.akuvox.com/firmware/release/beta?model_name=E21SV823) **Version:** 321.30.10.106 Note - It is recommended to use Release and LTS firmware. --- ## Release Notes ### Version: 321.30.10.106 (Beta) **Release Date:** October 21, 2026 **Supported SmartPlus Version:** V7.0 #### New Features 1. Support configuring holiday schedules. 2. Support event logs. 3. Support TLS 1.2 for device SIP registration and customer-uploaded server certificates. 4. Support reporting door-opened timeout alarms to the cloud. 5. Support reporting break-in intrusion alarms to the cloud. 6. Support configuring holiday schedules on the cloud. --- ### Version: 321.30.10.46 (Beta) **Release Date:** September 22, 2026 **Supported SmartPlus Version:** V5.4 #### Optimization - Updated the HTTP API. --- ### Version: 321.30.10.43 (Beta) **Release Date:** July 14, 2026 **Supported SmartPlus Version:** V5.4 #### Optimization - Improved the user experience. --- ### Version: 321.30.10.42 (Beta) **Release Date:** July 1, 2026 **Supported SmartPlus Version:** V5.4 #### Fixed Bug - Fixed a known issue. --- ### Version: 321.30.10.40 (Beta) **Release Date:** May 12, 2026 **Supported SmartPlus Version:** V5.4 #### Fixed Bugs - Fixed some known issues. --- ### Version: 321.30.10.39 (Beta) **Release Date:** May 6, 2026 **Supported SmartPlus Version:** V5.4 #### Fixed Bugs - Fixed some known issues. --- ### Version: 321.30.10.34 (Beta) **Release Date:** April 23, 2026 **Supported SmartPlus Version:** V5.4 #### New Feature - Extended the maximum SIP/IP call duration to 300 seconds. --- ### Version: 321.30.10.33 (Beta) **Release Date:** March 31, 2026 **Supported SmartPlus Version:** V5.4 #### New Feature - Added new web languages: Traditional Chinese, Spanish, French, German, Italian, and Dutch. --- ### Version: 321.30.10.31 (Release) **Release Date:** January 30, 2026 **Supported SmartPlus Version:** V5.4 #### New Features 1. Support customizing emergency audio. 2. Support synchronizing the emergency status from R49 guard phone. 3. Added Privacy Policy pop-up on the device and web portal. --- ### Version: 321.30.10.28 (Release) **Release Date:** November 4, 2025 **Supported SmartPlus Version:** V5.4 #### New Feature - Support customizing Hang Up prompt and adjusting Hang Up Volume. --- ### Version: 321.30.10.25 (Beta) **Release Date:** November 4, 2025 **Supported SmartPlus Version:** V5.4 #### Optimization - Optimized Ringback volume. --- ### Version: 321.30.10.23 (Beta) **Release Date:** September 5, 2025 **Supported SmartPlus Version:** V5.4 #### Optimization - Improved the user experience. --- ### Version: 321.30.10.21 (Beta) **Release Date:** August 8, 2025 **Supported SmartPlus Version:** V5.4 #### New Features 1. Support adjusting the ringback volume. 2. Support obtaining the device’s calling status via API. --- ### Version: 321.30.10.19 (Beta) **Release Date:** July 29, 2025 **Supported SmartPlus Version:** V5.4 #### New Features - Changed image message upload to the cloud from FTP to HTTPS. --- ### Version: 321.30.10.18 (Release) **Release Date:** April 1, 2025 **Supported SmartPlus Version:** V5.4 #### New Features 1. Support call schedule feature. 2. Support making call via triggering Input. 3. Updated daylight saving time. --- ### Version: 321.30.10.13 (Beta) **Release Date:** February 24, 2025 **Supported SmartPlus Version:** V5.4 #### Optimization - Improved device security. --- ### Version: 321.30.10.10 (Release/LTS) **Release Date:** November 21, 2024 **Supported SmartPlus Version:** V5.4 #### New Features 1. Support local Robin Call function. 2. Support configuring two SIP accounts for Dial Plan. --- ### Version: 321.30.10.6 (Beta) **Release Date:** April 12, 2024 **Supported SmartPlus Version:** V5.4 #### New Features 1.Support setting a mandatory listening time for multicast calls received. 2.Modified default values for resolution and bitrate. 3.Removed H.265. 4.Support disabling hang-up tone for multicast calls. 5.Enabled each input by default. 6.Support cloud-based door status display. 7.Optimized DTMF door opening experience. 8.Updated Daylight saving time. 9.Support hang-up after opening the door. 10. Increased the byte limit for room numbers. --- ### Version: 321.30.10.4 (Release) **Release Date:** November 21, 2024 **Supported SmartPlus Version:** V5.4 #### New Features - Added call hang-up prompt sound.