[Help] Getting errors in odin when trying to return to stock rom!

Hey guys ive been trying to find a fix for this for weeks now, there has to be a android guru out there that knows how to fix this. but anyways i flashed twrp and rooted my device sucessfully and got the custom rom to install without a hitch and the bootloader is also unlocked. but the issue is that in the new rom i cant get my 4g lte connection to work whatsoever so i decided to go to sammobile and downlaod the stock rom for my device the SM-S902L straight talk galaxy s5. i put my phone into odin mode/fastboot mode and load up the stock rom in the ap slot in odin, i hit start and always get the following error

I really hope you can help me with these. I am begging my data is not lost, I have lots of useful things... Im hoping i wont lose that.

<ID:0/003> Added!!
<OSM> Enter CS for MD5..
<OSM> Check MD5.. Do not unplug the cable..
<OSM> Please wait..
<OSM> I9195UBUBNA2_I9195CHOBMK1_I9195UBUBNA2_HOME.tar.md 5 is valid.
<OSM> Checking MD5 finished Sucessfully..
<OSM> Leave CS..
<ID:0/003> Odin v.3 engine (ID:3)..
<ID:0/003> File analysis..
<ID:0/003> SetupConnection..
<ID:0/003> Initialzation..
<ID:0/003> Get PIT for mapping..
<ID:0/003> Firmware update start..
<ID:0/003> SingleDownload.
<ID:0/003> sbl1.mbn
<ID:0/003> NAND Write Start!!
<ID:0/003> sbl2.mbn
<ID:0/003> sbl3.mbn
<ID:0/003> aboot.mbn
<ID:0/003> FAIL! (Auth)
<ID:0/003>
<ID:0/003> Complete(Write) operation failed.
<OSM> All threads completed. (succeed 0 / failed 1)

the device reads SW REV CHECK FAIL: [aboot]"Fused 3" > "Binary 2"


Anyone know what these errors mean and what to do?

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