done everything.. but still not working~~~
Installed "norton hack" app and restored all the quarantines, then installed "installserver rp+" and opened the "ROMPatcher Plus" and i chose Option - All patches - Apply.
Also, clicked "Add to auto" for both "Install server RP+" & "Open4All RP+".... and then rebooted my mobile....
tried installed an unsigned app called "Note Widget"... nothing worked out... same message again "Certificate error"...
don know wat to do???