Your Philips box is most likely not an HD DirecTivo. I don't think there has been anything but Hughes and DirecTV-branded HD DirecTivos.

If your Philips is running fast, it's probably a Series 2 that's running 6.2. 6.2 is the latest software released for Series 2 DirecTivos and has been out for at least a year now.
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-Rob Riccardelli
80GB 16MB MK2 090000736