hey, I am new here, and i'm extending my greetings to all in the house.

I have an 'assembled in Taiwan' iphone4 bought in China. problem is, the iphone is detected in windows xp as ' mtk mt 6235' iphone flash disk. no sign of apple. so, itunes, all versions, cannot detect the phone.not even 91assistant or any other iphone pc suite, recboot, iplus, redsnow, etc... can either detect the iphone. plus, the phone cannot enter dfu by all the methods i've tried online. how can i jailbreak this phone?
- iphone 4
- ios 4.3.3 8j2
- modem firmware 01.59.00

thanks for helping