Post [Q] sony xperia tipo dual build.prop HELP

Hey guys so i just changed my build.prop file of my xpeira tipo dual (downloaded it ) from a guy who has a tipo non dual he said to another person :
U need to change ro.product.device,.name,manufacturer
in short change Sony to Samsung and st21i to I9100
if u feel bored than extract my zip attached to this post and replace it with ur build.prop
in system folder with root explorer keep a backup of ur old one by copying it any where...
Yes still it will download data for Andreno but if u have problems than change Samsung to htc
And I9100 to desire_hd Samsung galaxy s2 to htc desire hd in my modified build.prop
and gave a file that i downloaded and replaced it by mine so i rebooted my device and i see the unfortunatly system ui has stoped working and my sim is also not working i did factory reset but same if any one of you guys have same device please give me your build.prop and a ideas to fix that
exuse my english im a n00b