---
title: "E21 V3.0 Firmware"
slug: "e21-v30-firmware"
updated: 2026-07-20T03:43:16Z
published: 2026-07-20T03:43:16Z
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:** 321.30.10.43

Note

- It is recommended to use Release and LTS version firmware.

---

## Release Notes

### 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.