H900-MT7621_v5.10.50 – 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.

H900-MT7621_v5.10.31 – April 2025

• Fixed an issue that cause RM520N to fail to dial up, this issue was introduced in v5.10.30.

H900-MT7621_v5.10.23 – October 2024

• Updated HTTPS cert files generate method.
• Added option to enable saving system log and kernel log during reboot.
• Fixed an issue that caused the add button not to be valid on SMS–>phone number page.
• Added ping IP to choose operator at Network–>mobile–>Operator selection page.

H900-MT7621_v5.10.20 – August 2024

• Added WIFI WLE600 support.
• Added Wireguard.

H900-MT7621_v5.10.7 – March 2023

• Fixed SMS gateway issue.
• Added support for long SMS.
• Changed text description of WEBUI system–>Password.