Use your computer to download the 3.41 update.pup file put it on a usb flash drive and update via usb on your PS3. Folder structure should look like this: PS3/UPDATE/PS3UPDAT.PUP
Originally posted by 25
Also, I have a 3.50 ps3, can I data transfer from the 3.15 or 3.41 ps3 to the 3.50 ps3 using an ethernet cord?
Yes use the transfer utility under SETTINGS on the XMB.