How to Revert to Old Firmware on LG HB405SU DVD Player?

To revert your `HB405SU` DVD player to an older firmware version, you'll need to download the appropriate firmware file. You can find it on the LG support website. Look for the version labeled `H80239` with a date of `2011.0318`. Once you have the file, it will likely be in a compressed `.zip` format. You’ll need to unzip it, which can usually be done with built-in tools on your computer. After unzipping, you should see a file named something like `H08HIN`, which is a `.BIN` file. Instead of burning it to a DVD, you can try using a USB flash drive. Copy the unzipped file directly to the root folder of the USB. Make sure the USB is formatted correctly and that the player can read it. Then, insert the USB into your DVD player and press the Play button. Keep the USB plugged in until the update process is complete, at which point the power should turn off automatically. If this method doesn’t work, you might want to download a different firmware version, like `LGHB5200.zip`. After extracting this file, you should see two files named `LGHB5200.ROM-00` and `LGHB5200.ROM-01`. Copy both of these to your USB drive, and then follow the same process: insert the USB into the player, navigate to the HOME menu, and press Enter on the remote to start the upgrade. If you continue to experience issues, it may be necessary to visit a service center to have the original firmware installed, as it seems the player might need professional assistance to resolve the ongoing problems.