From Phlips Web Site:

What's New in the Firmware:

ProntoPro NG Firmware Update
The ProntoPro NG firmware update is packed in a download tool that automitically installs the latest firmware in your device. It works independently from ProntoProEdit NG, and is easy to install.

Note: Please be sure to start up the Firmware updater before connecting your Pronto to the PC.

New in version 3.0.51
Improved learning
A new IR-learning module is implemented which makes ProntoPro NG less sensitive to learning distance, learning time, etc. The device will now also recognize IR-codes that were problematic to learn before like codes of Kenwood, Somfy, B&O, Yamaha, Onkyo, Grundig, Thomson and Echostar.

New in version 3.0.42.1
Problems solved

At regular intervals the device would crash due to RAM memory overflow. This is now fixed.