Does anyone have the firmware upgrade required for this? I was going to purchase a DHT500SD and was kindly sent the firmware for this by someone on this board, but I then changed my mind to buy the 550 instead. I probably should have coughed up the extra £80 and gone to AV land or,beter still Peter Tyson (it had just come in) and got it done by the shop, but went to Unbeatable (who are!) instead. On Unbeatable - delivery was tricky as they will only deliver to the address on the card (home) while I usually get stuff delivered to work, AND they mention they can do timed delivery (by CityLink) but I never got the option to select this. By the time I rang up to see why I hadn't heard about the delivery (24 hours later) it was already in the local warehouse, ready to be delivered the next day (great - but I didn't want to hang around the house all day) - luckily, it arrived just after 9 (though City Link wouldn't tell me when it would arrive - it must have been on the van already). It also turns out that if you were to get a neighbour to sign, they wouldn't be able to either. I've bought quite a lot of stuff via internet and this is the first time I've had all this hassle. Off home to play with it now.