(adsbygoogle = window.adsbygoogle || []).push({}); This is NOT a full fix, more like a semi-fix. Most PSN features will be bugged asf like the friends feature. Proven to be working on CEX and DEX.

So, I basically found a possibility to get online with older firmwares, i.e. Rebug 4.65 after the "protocol patch" of the spoofers (which isn't actually a patch, more a change to the servers due to security reasons). I do not know what this option exactly does as I did not found any information about it on psdevwiki.
However, it will allow you to get online on DEX firmwares. Please note that you won't be able to use the DEX Debug Menu.
Tested with Rebug 4.65.

1. Spoof your firmware to 4.66, just how you did it back then when spoofers worked.
2. In Rebug Toolbox, change the Debug Menu Type to CEX QA.
3. Quit the toolbox, go to the settings and scroll to the very bottom.
4. Press the buttons: L1, L2, L3, R1, R2, R3, DPAD_DOWN at the same time (!)
5. Open the Debug settings which now appeared.
6. Change the setting "Nav-only NP" to On.
7. Login.

As said, I don't know what this option exactly does. I just played around with the NP environment to see if you can get online by changing the NP settings, and it worked. If anyone could explain what this option does I'd be glad and add it to this post.

Sorry if this was already posted, did not found it anywhere on the internet yet. Only semi-fixes where changes to the flash files are needed.

Confirmed to be working on
Rebug REX
Rebug DREX
Rogero CEX
PS3ITA DEX

Known bugs
Friends feature doesn't work
Friends see you offline
Online playing doesn't work for some games
In the working online games, the username is set to "v"
You can get online with a banned CID (shall we consider this as a bug?)

lol dont work

Are you on CEX or DEX?

can you prove it

Look at the post above you, it obviously works for CEX. Not for DEX as it seems.
However, still a possibility to get online with Rebug.

also if your on cex why dont you just go to 4.66 habib.

its working for me
i can sign in but u i cant play online error comes out

Some people hate on Habib, I personally don't know why, however some people do. So it might be useful for people who don't want to switch to other firmwares.

Sonys Nightmare, I can play online perfectly fine, however can't add friends (as posted by Ballermann above). Which firmware are you on?