The Pronto Hex IR format for all formats except the FFFF raw learn is well documented both by Barry Gordon and Eigeny (Eugene) Eulanov. These docs are in the Classic Pronto Forum.

The issue is with the Raw Learn format and the ones that start with FFFF.

You will also have to dissect the 5000/6000 series of codes as these are RC5/RC6 and have toggle bits.