I need downgrade my phone

Hi guys,

my phone is SM-G900V, i like downgrade but not want, because try for odin put in the rom original verizon say me:

<ID:0/006> File analysis..
<ID:0/006> SetupConnection..
<ID:0/006> Initialzation..
<ID:0/006> Get PIT for mapping..
<ID:0/006> Firmware update start..
<ID:0/006> SingleDownload.
<ID:0/006> aboot.mbn
<ID:0/006> NAND Write Start!!
<ID:0/006> FAIL! (Auth)
<ID:0/006>
<ID:0/006> Complete(Write) operation failed.
<OSM> All threads completed. (succeed 0 / failed 1)

now this root lollipop 5.0 bpb1

i so sorry with my english.:crying::crying::crying:

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