Make sure you follow these steps;
1. flash drive/usb storage media, formatted to fat32
2. Make Folder and name it "PS3" in all capital letters, in usb stick.
3. Make a folder inside that folder, named "UPDATE" in all capital letters.
4. download and extract 3.41 update file, and ONLY place the PS3UPDATE.PUP file inside "UPDATE" folder.
5. Install usb into ps3, start it up, have controller an cable hooked up to ps3.
6. Press and hold both select and play buttons at the same time, it will ask for update , click X and update will install. And you have your ps3 back.
And if you feel i deserve it please +rep me, upper right hand corner or this post.