Aot4221sr: Firmware Upgrade __full__

: Reliable connectivity often drops after 8–12 hours of runtime, requiring a manual restart.

: 802.11ac Wi-Fi, 2x2 MIMO, and a hardware version typically noted as 8.0. Firmware Upgrade Report 1. Official Maintenance & Automatic Updates Most ISP-provided ONTs like the AOT-4221SR are managed remotely via the TR-069 protocol aot4221sr firmware upgrade