[Q] S4 Bluetooth issues after factory reset (HELP)

Hei guys! So I recently bougth myself an Alpine car Stereo with bluetooth. It worked like a charm with my GS4 connected, everything was great until I recently found out I should do a factory reset to wipe the phone. I had too much junk on it. So I did, and I spent hours customizing it again the way I want my phone to be. When I sat myself behind the wheel and connected to the car I noticed the music is interrupted with lag spikes every 4th second. Its annoying as hell! Ive tried updating it in kies and upgrading the firmware, still no change. Ive tried hard reset and cache wipe but that wont even work. I dont know what to do.. this really sucks..

It is a problem with the phone and not the Alpine, Ive tried other phones and they work great. So its the S4. I suspect it is a driver-issue but when I google it I get nothing. Seems like no one is in the same boat as me.

To mention I run the official 4.2.2 version and I cant get it to update. Ive downlaoded the 4.3 android version from sammobile but I dont know how to flash my phone to it with kies. I think maybe that could help. But other than that I have no clue!

Any help guys?

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