I can't start my phone unless I'm in safe mode. How to fix it? So I have a problem. My phone is booting in download mode and I can't start it unless I use the volume up  + home + power. I tried to wipe my phone, but it didn't  work and I lost my data for nothing.

When I'm able to start it, it's in safe mode and I can't remove the safe mode because when I try to, It's booting in download  mode.

My phone is a Samsung Galaxy S4 running on android 5.0.1.
Try to flash on it new firmware via Odin, you can read instructions and download Odin and new firmware at http://www.sammobile.com/firmwares/
It won't void your warranty.