If you would like to keep Linux and the OtherOS option open on your PS3 and have not yet updated to the latest firmware update, you can continue to use the PSN services through a cleaver hack. The hack doesn’t require any hardware modifications to your console and does not void your warranty – it simply tricks the console into thinking there is no update available.
The hack is similar to the hack we discovered when PlayStation Home was first in a closed beta. All you need to do is install the PS3 Proxy Server software on your PC and divert the PS3 to use your PC IP Address. The below video demonstrates the hack in more detail: