Hi,
To scale my DVDs I use an SDI modified Panny rp82 and the HOLO3D PCI card vid scaler from Immersive. I scale to 1080i on my Tosh 65H80. If you have visited the HT section of
www.keohi.com site and read comments that ISF'r Michael TLV made last summer about A/Bing the LG player, (Zenith's twin) with a scaled image from component, it was my setup that was used and I witnessed the comparison.
It was done relatively quickly because Michael had a plane to catch but the PQ that I saw makes either player a bargain. My setup is is much more complex and is really much more valuable to those using a front projector as the scaler can create any rez and size that any display unit can handle. It also scales any 480i input from composite component, s'vid and sdi, and is therefore more costly as in the $1300.00US area, but for straight PQ to 1080i,(my set doesn't do 720p) the results were very similar.
As far a firmware or any other kinds of modifications I have no idea, but right out of the box it was pretty damn good.
Peter M.