Note that some of the conclusions here are incorrect and have been updated in part 2
The firmware can be downloaded from Remote Central
Unzipping the download gives a single file, extfw-1.4.7-philips.bin
Despite the name, this is just another zip.
petergeraghty
Carrying on from part 1 we move on from codes converted from the old Pronto HEX format to learned codes
Initally these seem to have only a passing resemblence to the ECF codes converted from Pronto HEX. There are some bytes at the beginning that are the same but then after that not so much, and they are much, much longer
Here's a learned code for a Sony TV mute command, which is the same command that we had the Pronto HEX for