Switch GS1900 Series - V2.90 Patch 2 Firmware Release

Zyxel_Melen

Zyxel Switch GS1900 Series Release Note 

May 2026

Firmware Version on all models

(Click Hyperlink to download the firmware directly)

Zyxel GS1900-8 - V2.90(AAHH.2)C0

Zyxel GS1900-8HP - V2.90(AAHI.2)C0

Zyxel GS1900-8HP(Rev. B1) - V2.90(AAHI.2)C0

Zyxel GS1900-10HP - V2.90(AAZI.2)C0

Zyxel GS1900-16 - V2.90(AAHJ.2)C0

Zyxel GS1900-24E - V2.90(AAHK.2)C0

Zyxel GS1900-24EP - V2.90(ABTO.2)C0

Zyxel GS1900-24 - V2.90(AAHL.2)C0

Zyxel GS1900-24HPv2 - V2.90(ABTP.2)C0

Zyxel GS1900-48 - V2.90(AAHN.2)C0

Zyxel GS1900-48HPv2 - V2.90(ABTQ.2)C0

New Feature and Enhancements

1. Support for monitoring PoE port status via standard MIB OID .1.3.6.1.2.1.105.1.1.1.3.1.x with read-only access.

Bug Fix

1. [eITS# 251201670 ] Fixed typo issue in the CLI command output of show fiber-transceiver interface 

2. Fixed Pre-authentication buffer overflow vulnerability (CVE-2026-7273).

Please refer to the Download Link for more details.