Need some Serious help...

Hi peeps.

Ive really messed up my phone trying to root it...

Ive deleted the OS by accident. Ive downloaded a couple off the internet:
G920FXXU3DPFA_G920FTEF3DPF1_G920FXXU3DPF1_HOME.tar .md5
G920FXXU1AOCV_G920FTEF1AOC1_G920FXXU1AOCW_HOME.tar .md5

when i try to install either of these on Odin3 they just Fail.

I can access the download part and 'team win recovery project' on my phone

for some strange reason my pc now also says my phone is SM-G920S. But its a SM-G920F

From ODIN:
<ID:0/004> Added!!
<OSM> Enter CS for MD5..
<OSM> Check MD5.. Do not unplug the cable..
<OSM> Please wait..
<OSM> Checking MD5 finished Sucessfully..
<OSM> Leave CS..
<ID:0/004> Odin engine v(ID:3.1101)..
<ID:0/004> File analysis..
<ID:0/004> SetupConnection..
<ID:0/004> Initialzation..
<ID:0/004> Get PIT for mapping..
<ID:0/004> Firmware update start..
<ID:0/004> SingleDownload.
<ID:0/004> boot.img
<ID:0/004> NAND Write Start!!
<ID:0/004> cache.img
<ID:0/004> cm.bin
<ID:0/004> FAIL!
<ID:0/004>
<ID:0/004> Complete(Write) operation failed.
<OSM> All threads completed. (succeed 0 / failed 1)


Im really stuck ive been trying for hours and gotten no where:confused::(:(:(

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