---
title: "E21 V3.0 Firmware"
slug: "e21-v30-firmware"
status: "update"
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){target=`_blank`}
**Version:** 321.30.10.10

[E21 Release Firmware V3.0 (Click to download)](https://maintenance.akuvox.com/firmware/release/stable?model_name=E21SV823){target=`_blank`}
**Version:** 321.30.10.31

[E21 Beta Firmware V3.0 (Click to download)](https://maintenance.akuvox.com/firmware/release/beta?model_name=E21SV823){target=`_blank`}
**Version:** 321.30.10.43

:::(Info) (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.