I tried using neohacker to replace the default start page, following the instructions to click default start on another device. then opening it again in freedom edit (without saving) and upload.
that's where it goes wrong... freedomedit gives a warning about conversion between neo format & .ncf & i loose my start page again for a default 3page device list.
the files for the european version of the ProntoNeo (RU930) are also slight different to the TSU500.
Probably it is the same solution: tech.groups.yahoo.com/group/pronto_neo/message/923
Look what comment is in your original file and set it back it after changing the device page with neohacker.
Hope this helps