while playing with the psdowngrader i noticed something strange (yes i own an genuine psjailbreak, don't hit me plase).
i updated my PAL ps3 80gb fat to 3.50 just for fun to see if the downgrader is working (yes it is). after i downgraded back to 3.41 i was able to sign in into PSN and PSN store without any problems with no apps installed in JB mode. after that i installed blackboxFTP and original BUM 1.1 and so the access was gone. i am using the CE-X hybrid payload for olimex board. maybe its not the spoof payload that fails, it could be that sony detects these apps on our systems and blocks the login.
i tried it several times i went from 3.41 to 3.15 and back. everytime the 3.41 was freshly installed i had no problems accessing the PSN until i installed one of those apps. please have mercy with my bad english and i have no clue about engineering. i just noticed this not more not less.