You are following the steps, but the TV isn't cooperating. Here is the fix for the most common issues:

| Problem | Likely Cause | Solution | | :--- | :--- | :--- | | "No update available" | You are on the latest version, or the server is down. | Check ImpEX social media pages. You might already be up to date. | | Update freezes at 50% | Weak Wi-Fi signal or corrupted download. | Cancel. Restart router. Delete the downloaded file and try again. | | TV won't turn on after update | Power outage during flash or wrong firmware. | Unplug for 5 minutes. Try the USB recovery method. If that fails, contact warranty service. | | Apps keep crashing after update | Old cache conflicting with new OS. | Go to Settings > Apps > See all apps > Find app > Clear Cache & Data. | | USB not recognized | Wrong format or file name. | Ensure USB is FAT32. Rename file exactly as required (usually update.zip or MstarUpgrade.bin). |

bool downloadUpdate(json manifest) 
    std::string url = manifest["firmware_url"];
    std::string expectedHash = manifest["checksum"];
downloadFile(url, "/storage/update.bin");
std::string actualHash = sha256_file("/storage/update.bin");
if (actualHash != expectedHash) 
    return false;
return true;

While updates are generally good, Impex users have reported specific downsides post-update: