Aot-4221sr Firmware Upgrade Jun 2026

Use this if the device is bricked:

The is a high-performance ONT (Optical Network Terminal) typically deployed as the Airtel Xstream Fiber router. Upgrading its firmware is a critical maintenance step to patch security vulnerabilities and improve device stability. Accessing the Router Interface aot-4221sr firmware upgrade

Click the or "Browse" button and select the firmware file you downloaded in Step 1. Click "Upgrade" or "Update." 5. Wait for the Reboot Use this if the device is bricked: The