USG FLEX H Series - V1.37 Patch 1 Firmware Release

Zyxel_Melen

Zywall USG FLEX H Series Release Note 

February 2026

Firmware Version on all models

• Please use the cloud firmware upgrade function to upgrade USG FLEX H Series

USG FLEX H Series	Firmware Version
FLEX50H	V1.37(ACLO.1)C0
FLEX50HP	V1.37(ACLP.1)C0
FLEX100H	V1.37(ABXF.1)C0
FLEX100HP	V1.37(ACII.1)C0
FLEX200H	V1.37(ABWV.1)C0
FLEX200HP	V1.37(ABXE.1)C0
FLEX500H	V1.37(ABZH.1)C0
FLEX700H	V1.37(ABZI.1)C0

New Feature and Enhancements

1. [Feature Change] [SNMP] SNMP Configuration Validation Enhancement,
   • When SNMP v1 or SNMP v2c is enabled, SNMP Community 1 and Community 2 are now mandatory fields.
   • Real-time validation has been added to ensure required SNMP Community fields are properly configured.
   • When both SNMP v1 and SNMP v2c are disabled, SNMP Community and Trap settings are grayed out and cannot be edited. 
2. [AP Controller Feature Change] None.

Bug Fix

1. [eITS#251201653] Incorrect routing behavior when a VLAN is configured over a LAG interface.

2. [eITS#260100500, 260101410, 260101279, 260101414, 260101659] IKEv2 remote access connection failure occurs when authentication is set to cloud authentication.

3. [eITS#260101235] After upgrading the FLEX H firewall to v1.37, the managed v7.10 802.11ax APs show a Limited status with the reason “SNMP 2 Community.”

4. [eITS#260101298] After logging in to the Web-GUI, the error message “No free session slots available” could be displayed, and clicking “Logout” would terminate the session and prevent the user from logging in again for up to 24 hours

Please refer to the Download Link for more details.