Who in their right mind would dl cfw's and updates to it from a filesharing program when you can go to m33's site and dl it from them directly. If you went over ur friends house, you would hopefully be smart enough to look at your friends psp to see if it bricked. Its all common sense, dont update if ur friend bricked thats just not smart.
Ive used the m33 3.52 firmware all of the way up to update 4 without any problems. Great releases no matter how small they are great work m33 keep it up.