There are several versions of GM220-S firmware circulating in the market, notably and v9 . Firmware Gm220-s
If you'd like to troubleshoot a specific error or need help finding a download link: What is your device currently running? What internet provider are you using with this modem? GM220S GPON XPON 1GE 3FE 1POTS WIFI Modem ONU Firmware Gm220-s
Download a matching .bin file from a reputable source (e.g., GMTech Support ). Upload it through the Firmware Update section. There are several versions of GM220-S firmware circulating
Dual-mode support (GPON/EPON), PPPoE for home use, and Hotspot/Voucher mode PPPoE for home use