From VSPROD: It seems that the YouTube APP won't appear at all on the XMB when you are in 3.55 (4.10 APP) So I have created a PKG from the official Sony YouTube APP.. and an other PKG: the Fix 3.55. should work for 3.41 too.
1. Install my first PKG:UP2075-NPUP10028_00-YOUTUBE000000001
2. Install my 3.55 Fix: YOUTUBE105_FIX_341355_VSPROD
Now after the installation, launch multiman and you have to go into Dev_hdd0/game/NPUP10028/ and create a new folder called: PS3_GAME.
Now you will have to copy everything that in the NPUP10028 folder into PS3_GAME folder. After that go to PS3_GAME/USRDIR and click on EBOOT.BIN and create a desktop shortcut (with the circle button...