no devices can be found via bluetooth after update to ios 7.1

Hallo Guys and Ladys!

Im sry for my bad english, but i hope u can understand me request.

Its exactly the problem, where u find this thread.

I updated to ios 7.1 and at the next day i wanted to connect my iphone5 with my car-radio to play my favourite classic-music. I waited 5min. to find my radio on the iphone, but nothing. I searched for my laptop, it wasnt found. I cant found any bluetooth capable device on my iphone. But every device can find MY IPHONE. I found it from my laptop and can connect to it.

But there is a problem with my car-radio. My car radio has no a search-function, so i NEED to found my radio with my iphone to connect to it.

I resetted my iphone to factory settings and did NO backup, to have my iphone naked. But i cant find any devices too.

I have no idea what i can do know.

Does anyone have the same problem and does anyone know how to fix that bug?