Aot4221sr | Firmware Upgrade _top_

: It is strongly recommended to perform updates via a wired Ethernet cable rather than Wi-Fi to avoid connection drops. Step-by-Step Upgrade Guide 1. Access the Admin Interface Tutorial: How to Updating Firmware on TP-Link EAP660 HD

If your specific AOT4221SR model is from a private-label vendor (e.g., "ABC Industrial Switch"), the upgrade steps are identical, but the firmware file may be rebranded. Provide the output of show system or cat /proc/version in a support ticket for exact guidance. aot4221sr firmware upgrade

| Issue | Likely Cause | Solution | |--------|--------------|----------| | Device not entering DFU | Wrong button sequence | Repeat: Hold BOOT, then power on, release after 3s | | Upgrade stalls at 50% | Corrupted firmware file | Re-download .bin from official source and verify SHA256 checksum | | No response after upgrade | Bootloader mismatch | Use recovery SD card method to reflash a compatible bootloader first | | Configuration lost | Factory reset triggered inadvertently | Restore from backup taken earlier | : It is strongly recommended to perform updates