has examined PSP firmware v3.80 changes, and here are the results:
They now know that with Pandora, we can always access the flash, so they've focused on locking down the PSAR and changing the format of the files/flash. Just more tactics to slow down decryption, but it won't work.
They have only changed the keys of the tables of filenames. The prx's keys are the same than in 3.7X.