Firstly thanks to the guys behind Custom Firmware Validator a simple but excellent tool that quickly scans any PUP and provides information about it's validity. I have recently found that certain DEX PUPs weren't in the current database, after a bit of googling with no success I decided to edit the XML myself.
1. Download the provided XML (odb_ps3_mod).
2. Move the XML into Custom Firmware Validator's 'databases' folder.
Should the database not load you can manually select it within the program.
PUPs added to the database- 3.55 DEX downgrader, OFW DEX 4.10/11/20/21,
DEX MFW, _Exceedy_ DEX MFW's, Rogero DEX MFW's, Harryoke DEX MFW,