Tried to flash my phone with an older kernal and now i'm stuck in recovery mode.

Hello the phone I'm using is s5 active at&t.
I followed this guide http://ift.tt/1YFL33A

But for some reason everything went to the dumps. I then looked up some guides and got a stock firmware from sammobile G870AUCU1ANE4_G870AATT1ANE4_G870AUCU1ANE4_HOME.tar .md5

Odin recognizes the phone as it shows it in the ID:COM area but then it fails.
<ID:0/004> Odin v.3 engine (ID:4)..
<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> aboot.mbn
<ID:0/004> NAND Write Start!!
<ID:0/004> FAIL! (Auth)
<ID:0/004>
<ID:0/004> Complete(Write) operation failed.
<OSM> All threads completed. (succeed 0 / failed 1)

My first time trying to root. It brings me to the recovery screen with a bunch of options and I'm capable of getting it to the download screen holding volume, home, power.

Please any help would be great.

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