Alright.. I really did every single thing I could.. Searched everywhere already.
Situation is that I updated my firmware to 3.03oea' without any problems.. I can access Wi-fi on internet browser, but whenever I try multiplayer in a game over AD-HOC, it either says connection failed in a racing game or, in GTA:LCS, the screen keeps flashing in the multiplayer page where you either Join Game or Host Game.
Initially I thought it was a firmware problem.. So I downgraded from
3.03OEA' 1.5 --> 2.0 -->1.5 --> 3.03OEA --> 3.03OEA --> 3.03OEB.
However, it still does not work now.. And I'm tearing my hair out over this. It also should not be a installer corruption because I upgraded the exact same firmware for my friend, except that his was already 1.5. Could the 1.5 update be the problem?
Secondly, it was working in 3.03OEA or 3.02OEB.. I forgot.. But when I upgraded to 3.03OEA' it stopped working..
I seem to be either the first or the rare few that has this problem.. Sigh. Hope there's a solution. Now I'm in the midst of deciding whether to go back to 3.03OEA, but I have no idea how except 1.5 --> 3.03OEA. And someday, there'll be a custom firmware with big updates and if there's the same problem.. I'm pretty much screwed.