However, if you own a legacy device or a highly customized operator-locked box, consult your service provider first.

If you encounter issues during the process, refer to these common troubleshooting scenarios:

Once the bar reaches 100%, the set-top box will automatically reboot. Troubleshooting Common Upgrade Errors

Verify the file hash if possible to ensure the download was not corrupted. Installation Guide: Stb Upgrade Ver 4.0.2

: Developers use it to test new software releases locally before deploying them "Over The Air" (OTA) to all users. Key Features of Version 4.0.x

Never turn off your device during an update. If your area experiences frequent power outages, plug your STB into an Uninterruptible Power Supply (UPS).

If your set-top box is stuck on a red light, displays "ON" constantly, or is otherwise "bootlooped," you must flash the firmware using a computer and an RS232 serial interface.

Complete Guide to STB Upgrade Ver 4.0.2 Download and Installation

– I can draft a safe, clear, and informative guide for upgrading an STB to version 4.0.2. Just tell me:

Ensure "Include Bootloader" is checked if you are doing a full system recovery.

Open the main menu and navigate to > Software Update > Network Upgrade (or FTP Upgrade ).