unbranded android 2.2 FG8

[H.Karim]

hi, first time posting , i have an unbranded chinese a.k.a. htc desire clone ,FG8 ,
im having problem with voice search app ,how can i fix this app or remove it

about the phone

model no A601
version 2.2.1
kernel version 2.6.32.9
hardware MT6516 E1K
cpu ARM926Ej-s rev 5 (v5l)

can i able to reinstall the OS ??????????

i tried factory reset ,root the phone , it doesnt root ,dont remmeber which app i use for this ,nothing helps

any advice is welkom ,
please dont tell me to buy 500Euro htc desire ,thanks