I have been having similar problems and tried the solutions in this thread, with no success. However, I emailed Humax and received the following:
Dear Sir Please follow the steps below to perform a Default reset 1. Power OFF the receiver 2. Disconnect the Aerial cable 3. Power On the receiver 4. Press MENU 5. Select Installation
6.
Enter your password (Default = 0000) 7. Select Default Setting 8. Select YES 9. Enter your password (Default = 0000) 10. When the receiver restarts, power off 11. Connect the Aerial Cable 12. Power ON - the receiver will then search for the channels. Best regards Humax Technical Support
It looks remarkably similar to solutions previously posted here, so I'm not holding my breath. More promisingly, though, while waiting for this reply, I accessed the Humax site again and found in support/downloads that a software update has been issued, dated 12 November (UPTTF 1.00.18) which claims it has "resolved intermittent lock up issue". Good news? Well, almost.
Another email to Humax support produced the information that this update has not yet been broadcast to air, and the download schedule shows it's not due this week nor next. You could, of course, download and install it manually. All the instructions are on the website. Simple.
Well, not quite. Firstly, you need an RS232C cable to connect your Humax to your PC. DB9 female/female connectors for a desktop and female/male for a laptop. Also, I believe (from another forum) it needs to be "null modem" rather than straight. Naturally, I don't have one, but
dabs.com - Laptops, Components, MP3 players, Software, Digital Cameras has just the thing at only £4.55 including delivery. It's on its way.
Next, you need to download the update software to your PC (that was straightforward) and also an update tool snappily named WDN40AK+.zip. This appears on your PC with the name FILE (no, seriously) and will have to be renamed with a .zip extension before you can open it. You then have to decide which of the several unzipped files to open (all called setup) to get it to install. I forget exactly which one worked, but it's not the obvious, pretty-coloured but the serious program icon with an exe extension. Now you move the newly created short cut out of the obscure WDN40AK folder and on to your desktop so you can find it again, and you're ready to roll.
I can't wait to get my cable, hook it all up, and press the enter button. Last time I tried a software update off the internet, my mobile never worked again. Now, where's my old video recorder?