I can't flash my stock firmware in my Galaxy J500H

[Clickeh]

It all started when my Samsung J5 began being weird.. like "weather app keeps force closing affecting my S Planner". so I tried to turn off my phone and came to my TWRP Recovery.. and then for some stupid unknown reason. I wiped everything.. Dalvik, System, Data, Internal Storage, Cache, Micro SDCard, USB-OTG without even thinking that I need to turn my USB Debugging mode or OEM ON or even better.. BACKING UP... so I screwed up. I tried to use Odin. and reflashed my phone to it's original state. and then this happened...

<OSM> Enter CS for MD5..
<OSM> Binary Check MD5.. Do not unplug the cable..
<OSM> Please wait..
<OSM> Checking MD5 finished Sucessfully..
<OSM> Leave CS..
<ID:0/007> Added!!
<ID:0/007> Odin engine v(ID:3.1100)..
<ID:0/007> File analysis..
<ID:0/007> SetupConnection..
<ID:0/007> Initialzation..
<ID:0/007> Get PIT for mapping..
<ID:0/007> Firmware update start..
<ID:0/007> SingleDownload.
<ID:0/007> aboot.mbn
<ID:0/007> NAND Write Start!!
<ID:0/007> FAIL! (Auth)
<ID:0/007>
<ID:0/007> Complete(Write) operation failed.
<OSM> All threads completed. (succeed 0 / failed 1)

I don't know what to do. and I'm scared. I tried to find solutions in forums such as this but I cannot find the right solution. Can you help me? I really need this... My mother's gonna kill me.

 

[B. Diddy]

Moved to the new J Series forum.