N9005 Cannot Flash Stock ROM

HI,
Im trying to load a stock firmware onto my 32GB N9005 Note 3, but its failing when the flash starts.
I downloaded a HK version of 5.0 ([247616]»˝–«_N9005_N9005ZSUGOL1_÷–π˙œ„∏€(TGY)_5.0.20160317 183141.tar) , and it fails at some security check at the start ( Fail(Auth).

Id like to do one of 2 things:

1) Figure out how to fix the security problem so i can load the stock 5.0 on to it
or
2) I also downloaded the stock 4.4.2 , but its not in a tar.... its come in a folder with 6 files.
AP_xxxxxx.tar
BL_xxxxxxx.tar
CP_xxxxxxxx.tar
CSC_xxxxxxxx.tar
HLTE_HKTW_OPEN_16GB.pit
HLTE_HKTW_OPEN_32GB.pit

Can i use odin to flash the 4 files in 1 go to update to the stock version?

The phone was bought from China about a while ago, and its currently running a version of 4.4.4. It looks to me like its running a custom ROM, which was preinstalled from the dodgy place i bought it from, details are below:

Baseband: N9005XXUGNG1
Build Number: DONGCHAO.A429
Kernel Version:
3.4.0-2593013
dpi@SWDD6004 #1
Friday Nov 28 14:31:10 KST 2014
Hardware 1.06

Philz Touch also installed.....

Any help would be greatly appreciated!

Thanks

G

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