Guys ive founded a way to root it with recovery mod,here is the link:
http://androidforums.com/xcover-all-things-root/515581-universal-gingerbread-root-unroot-2-3-3-2-3-7-a.html but when i enter in recovery mod,i click on apply update from sd card and find universal_gb_root_v20.zip,it shows:
-- Install /sdcard ...
Finding update package...
Opening update package...
Veryfying update package...
E:failed to veryfy whole-file signature
E:signature veryfication failed
Instalation aborted.
What to do ??