H820-7628_v3.3.x Firmware Downloads

This page contains firmware levels for the H820 4G router.

There have been three versions of this model. 

Version 3 / From January 2026 / H820t-W-v3 -> v3 is shown on the part number. This latest version has increased RAM capacity of 128MB (up from 64MB). Some initial batches have an alternative on the underside sticker, which shows the part number H820t-W, with ‘RAM:128MB’ on the line below the part number. These models can run the latest firmware series v5.10.x (H820-7628_v5.10.x), and is also compatible with this firmware series H820-7628-v3.3.x. It can be up and down-graded between these two firmware series. 

Version 2 / January 2023 – January 2026 / H820t-W -> This is version 2 (v2), however it does not have a part number to state this. It is recognisable by the second WiFi antenna on the side of the unit. This version only runs this firmware series H820-7628_v3.3.x .

Version 1 / Pre January 2023 / H820t-W -> This version had one WiFi antenna. It runs only on firmware series H820-RT5350-v3.2.x. (click here to visit the firmware page)

Applicable Part numbers:

    • H820t-W-v3
    • H820t-W

(The part number is found on the underside label of the router).

Changelog

H820-7628_v3.3.93 – April 2026

  • Two related security issues in the IPsec PSK handling have been fixed. The PSK could be briefly written to standard output during service start, where it could potentially be captured in logs or diagnostic exports. The runtime secrets file holding the PSK was also readable by local non-privileged processes on the device. Remote access to the VPN is not affected. Customers using IPsec VPN are advised to upgrade as soon as possible and to rotate the PSK on each device after upgrading.

H820-7628_v3.3.92 – March 2026

  • Fixed intermittent WEBUI loading bug introduced in v3.3.91

H820-7628_v3.3.91 – March 2026

  • Enabled from default the IP Timeout (brute force protection) on WAN for administrative protocols (SSH, HTTPS, HTTP), seen in WEBUI Network > Firewall > Security. Whilst these functions could be toggled on in v3.3.90, they were not enabled by default due to an error.

H820-7628_v3.3.90 – March 2026

  • GPS TCP server can send DIO commands to set or get DIOs
  • Updated dropbear from 2019.78 to 2022.82
  • Fixed SNMPv3 issue which caused it to stop working on some configuration change.
  • Added event log to track attempts to authenticate to the server via, HTTP, HTTPS, SSH.
  • Changed the system functionality of admin user, so the SSH login account has the same password as the WEBUI admin account, changing one automatically updates the other unless they are explicitly configured to be separate.
  • Added minimum password complexity requirements
  • Improved the layout and added new features to WEBUI of Network > Firewall > Security page. Here settings for access control via management protocols to the router are configured. The Remote Access IP Whitelist function has been changed, now when enabled, this firewall rule is processed before all other traffic rules, and no new traffic rules are created in Network > Firewall > Traffic Rules.

H820-7628_v3.3.88 – January 2026

  • Added support for module RG200U.

H820-7628_v3.3.87 – October 2025

  • Implemented the use of separate IKEv2 ESP for multiple subnets.
  • Improved the robustness of code in SMS feature.

H820-7628_v3.3.85 – June 2025

  • Added support SLM770A CE.

H820-7628_v3.3.79 – December 2025

  • Added support for SLM770 and EC200A.

H820-7628_v3.3.78 – November 2024

  • Fixed issue that configuration in wizard not saved after power off and power on.

H820-7628_v3.3.77 – October 2024

  • Fixed route based IPSec issue. need to config VTI static IP on IPSec config page.
  • Fixed issue where RM500 shows SIM error and 0 signal strength on web GUI.

H820-7628_v3.3.75 – October 2024

  • Updated uhttpd.
  • Updated HTTPS cert files generation method.
  • Added option to enable saving system log and kernel log during reboot.

H820-7628_v3.3.73 – September 2024

  • Added Modbus registers for modem status. like coordinate, strength, rsrp, rsrq, etc.
    register 1~2, longitude
    register 3~4, latitude.
    register 5, satellites number.
    register 6, strength.
    register 7, rsrp.
    register 8, rsrq.
    register 9, sinr.
    register 10~15,product ID, like H820T-w.
    register 16~27 network name.
    register 28~39 SN.
    register 40~47 IMEI.
    register 48~55 mobile interface IP.
    register 56~63 firmware version.

H820-7628_v3.3.70 – August 2024

  • Fixed language issue at page System–>Language.

H820-7628_v3.3.69 – August 2024

  • Added Modbus support GPS coordinate and modem signal strength.

H820-7628_v3.3.68 – August 2024

  • Fixed issue with IPSEC/L2TP, where sometimes l2tp is not started properly.

H820-7628_v3.3.67 – June 2024

  • Fixed several vulnerabilities of UI.

H820-7628_v3.3.66 – May 2024

  • Fixed issue where WIFI password doesn’t change after resetting when unique password is enabled.

H820-7628_v3.3.65 – May 2024

  • Update password generation algorithm.
  • Changed from DNS to IP at real time graphs connection page.
  • Added GPS status on overview page.
  • Added GPS status gateway.
  • Fixed issue that caused SIM username/password to have $ symbol.
  • Added option to change logo background color.
  • Added TCP server option on GPS config page.

H820-7628_v3.3.59 – May 2024

  • Updated NMS.

H820-7628_v3.3.58 – January 2024

  • Save config files in flash as backup automatically.
  • If config via UCI command or edit files in SSH, it requires to run command “save_flash”.
  • Removed Flash Backup and Restore at page System–>Back / Restore.
  • Force to change password, new password can be same as default.
  • Fixed reboot GUI issue.
  • Fixed upload logo issue.

H820-7628_v3.3.57 -November 2024

  • Added support for module EC200.

H820-7628_v3.3.56 – October 2024

  • Added No-IP support in DDNS.

H820-7628_v3.3.55 – October 2024

  • Updated new web UI.

H820-7628_v3.3.53 – September 2023

  • Fixed issue where ipv6 up but cell led is not on.
  • Updated operator selection.

H820-7628_v3.3.52 – August 2023

  • Added feature to run c script in /etc/config/script.custom .
  • Fixed dynamic routing password issue.

H820-7628_v3.3.44 – March 2023

  • Added support for longer SMS.
  • Changed text in the ‘Password’ page for WEBUI.