You can also get the firmware directly from Philips along with instructions on how to upgrade it.

Got to http://www.pronto.philips.com
Click on "Downloads"
Login (or create and account)
Click on "firmware"
Click on "firmware archive"
Choose the firmware for your model

[Link: remotecontrol.philips.com]

This is Sys. 4.8, App 5.3 release date Aug26, 2002. It is an executable, so I don't believe you need to upgrade prontoedit to use it -- but if you are using an older version of prontoedit, I don't know why you wouldn't want to upgrade it too.

Before you do anything, check the current firmware version on your remote

See the Unofficial Pronto FAQ for details:
[Link: remotecentral.com]

Joe