I have an HB-1000S box that appears to have corrupted firmware. The box boots to the initial setup screen and then hangs with no inputs accepted from the handset. The front panel standby switch works ok. I have downloaded the file for 3.00.20 from the Humax site and made up a USB stick. The instructions on the Humax site say "Press and hold the Channel DOWN button/arrow on the front/top of your set top box and at the same time switch it back on at the mains or reconnect the power cable". Ok - there is no front panel Channel Up/Down button! So how do you force a power up install of the firmware from a USB stick or another port?