Please Help... Singing a .jad file

[kunn]

Hmm... I tried every thing.... Possible with my phone...
Though i don't hav a pc to try higher level of edit....
I edited the manifest codes.... Gave signatures still it wont work that's the reason i always download from ovi.... They have singed (certificate) files which my phone runs perfectly...
I tried using the same codes of a singed .jad and an unsigned .jad file but it won't work... It will always say invalid file... I don't understand even though i made the perfect copy of a singed file... It will say invalid file and if i give an unsigned .jad then it works but not to it's maximum....