Free Flash Drivers

Hello

I tried to instal xposed framework but no I cant start my phone, it is in a bootloop :(
My phone: Samsung galaxy S5 (SM-G900F) 16Gb

I tried a few things:
I tried to instal the custom firmware with odin the (for the SM-G900F: Android 6.0.1 Marshmallow)
After I tried to flash it with odin I get this error:
volume size is too big
ODIN:Invalid ext4 image

Then I tried to flash it with together with a pit file (I got the 16Gb version so I used
Now I get an error: Secure check fail:pit

I dont know what to do now.