Firmware with urdu language is not available on the net , but if you facing speed issue ,you must try Custom Rom its faster better and save more battery ,
Here is the Forum ..
http://forum.xda-developers.com/showthread.php?t=1136798
Download GIOPRO v1.1 not v1.0 .. 1.1 is availble at same page scroll down...
and don't forget to follow everything , A2sd is great feature must use it to make your phone faster and saves battery...
A2sd will install apps on you sd card , so you your internal phone memory will be more free it will help to perform fast .. good luck..
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Waqas Shahzad
Lahore
Developer