4160B - dual layer question

I have an LG 4160B (firmware 301) and can’t work out how to use dual layer DVD burning. I use Nero ver 6 and Pinnacle Studio 9 - both apps don’t offer the 8.5GB capacity as an option (but are OK on single layer DVD). How can I test what the problem might be?

I use Nero (ver, too. Firmware A303. When burning a Data /Video DvD I can choose from Dvd5 and Dvd9 in the window where you add your data to be burned.

Think I’ve solved the problem - it’s the software that does not recognise the drive dual layer - will need to upgrade.