---
title: "SL20 Firmware"
slug: "sl20-firmware"
updated: 2026-09-17T02:05:07Z
published: 2026-09-17T02:05:07Z
canonical: "knowledge.akuvox.com/sl20-firmware"
stale: true
---

> ## 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.

# SL20 Firmware

> [!NOTE]
> **NOTE:**
> 
> This lock can only be upgraded through the akubela Cloud and does not support local firmware uploads.
> 
> Refer to [the upgrade guide](/v1/docs/upgrade-akubela-smart-locks) for detailed instructions.

---

## **Release Notes**

### **Version: 20.1.10.76**

**Release Date:** June 16, 2026

#### **Optimizations**

1. Updated the Wi-Fi module SDK to resolve an issue that could cause slow cloud connection speeds.

---

### **Version: 20.1.10.51**

**Release Date:** November 17, 2025

#### **New Features**

1. **Device Adding:** Support pairing with device via Bluetooth or AP mode.
2. **User Management:**
  - Support adding administrator and regular users through the BelaHome app.
  - Support adding user codes through the BelaHome app.
3. **Temporary Passwords:** Support adding offline one-time passwords and periodic passwords via the app.
4. **Unlocking Methods:** Support unlocking via PIN code, card, remote app control, indoor open button, and mechanical key.
5. **Locking Methods:** Support locking via indoor locking button, the * key on the keypad, and mechanical operation.
6. **Doorbell:** Support doorbell event notifications.
7. **Device Logs:** Support displaying door-opening and alarm events in chronological order.
8. **Feature Configuration:** Support changing lock sounds and auto-lock time via the app.
9. **Upgrade:** Support cloud-delivered firmware packages and OTA upgrades via the app.