Firmware Gm220s Top __link__ Jun 2026

After the firmware upgrades and the ONT reboots:

. Firmware updates for this device are critical for unlocking features like "dual-mode" operation (XPON), which allows the device to work on both GPON and EPON networks Device Specifications firmware gm220s top

You cannot flash generic Zyxel firmware onto an ISP-locked unit. The bootloader is signed. After the firmware upgrades and the ONT reboots: