So I did all the same steps to open a PSVita game's manual in Near, and then I tried to dump using CMA. Turns out, I get C2-17775-7 trying to transfer the PSP game used for the dump to my PC. A quick google search shows some other people running into the issue trying to dump games on 3.55.
I then tried to backup the game like normal to my PC, and got a similar error code (C2-17119-9). Turns out, both these errors go away when I close the Near app.
This leads me to believe in 3.55, Sony patched not only failmail, but access to the game's ux0:/app/ folder when it's already being accessed by Near..
Instead of using the CMA at all, I then tried moving the folder to my computer using molecularShell's FTP (I also tried with vitaFTP, same results). That's when I confirmed my hypothesis.
With the game manual open in Near alongside the FTP, Filezilla gives me this error accessing the game's folder. However, any other game's folder is perfectly accessible.
When I close Near, and return to FTP, it works as expected, although the contents are immediately encrypted:Status: Retrieving directory listing of "/ux0:/app/PCSE00491"...
Command: CWD /ux0:/app
Response: 250 Requested file action okay, completed.
Command: CWD PCSE00491
Response: 550 Invalid directory.
Error: Failed to retrieve directory listing
It doesn't matter if I use vitaFTP or moleculeFTP. I've only tried this with filezilla so far.Status: Retrieving directory listing of "/ux0:/app"...
Status: Directory listing of "/ux0:/app" successful
Status: Retrieving directory listing of "/ux0:/app/PCSE00795"...
Status: Directory listing of "/ux0:/app/PCSE00795" successful
tl;dr permissions to even access these files are revoked if Near is accessing them, and there's no other way to decrypt the PFS (that I know of). Dumping confirmed dead on 3.60?
EDIT: bibibi claimed he could dump using the email app instead of near on 3.60. I tried this method, launching the manual in the email app and connecting to PC with FTP, but I get the same errors as above regarding "550 Invalid directory."
atreyu187 says he is working on a way to "decrypt games" on 3.60 here, but no further information was provided.