I've updated Davee's Chronoswitch to v7.2:
- Added 07g support.
- Fixed IDXFFFFFFFF & CAAFFFFFCF7 errors, by replacing the personal 'factory FW' check, with a generic 'minimum FW' check based on the PSP's motherboard.
- Removed 6.20 support for 09g.
Download & source:
https://github.com/TheZett/Chronoswitch/releases
This release should fix most issues where a PSP was not downgradable due to getting a CAAFFFFFCF7 or IDXFFFFFFFF error message.