To rescan channels on your Humax S-HD-3 box, follow these steps:
1. Press the "Menu" button on your remote control.
. Using the arrow keys, navigate to the "Settings" option and press "OK".
3. Select "Installation" from the menu and press "OK".
4. Choose "Automatic Channel Scan" and press "OK".
5. You may be prompted to enter a PIN. If you have set a PIN, enter it and press "OK". If not, continue to the next step.
6. Select the "Start Scan" option and press "OK". This will initiate the channel scanning process.
7. Wait for the scanning process to complete. It might take several minutes.
8. Once the scan is finished, the new channels will be displayed on your screen.
Note: The exact steps may vary slightly depending on your specific Humax model and firmware version.