4 stuck on itunes

ok guys iphone 4 : the problem happened by it self i mean no up or downgrade or jail braking
stuck on itunes when u connected to i tunes in DFU it did restore but in the preparing phone state an
error 3194 came
1.tried a lots with itunes and other cables and other pc’s =no chance
2.tried tinyumberlla to get of itunes =stocked in apple sign and after while back to itunes
3.try all the ihack tools to change the itunes mode=no chance
4.changed the charging port =no chance
any ideas????