Can't flash from AT&T back to Verizon or T-Mobile on a Verizon Note 7

Got Black Note 7 from Verizon yesterday.
As we all know, V's firmware messed up with the original system quite a lot. So after a bit search, I decided to flash it to T-Mobile Firmware.
With Odin3, easily done. However, LTE not working, not cellular either, emergency call only. Then decided to flash to AT&T according to one of the threads(maybe link later).
After flashing to AT&T firmware, still no LTE, emergency call only.
When I tried to flash it back to Verizon, Odin3 stopped me from doing so and gives SHA256 error.

<ID:0/004> Added!!
<ID:0/004> Odin engine v(ID:3.1205)..
<ID:0/004> File analysis..
<ID:0/004> skip file list for home binary
<ID:0/004> persist.img.ext4
<ID:0/004> Home Binary Download
<ID:0/004> SetupConnection..
<ID:0/004> Initialzation..
<ID:0/004> FAIL! SHA256 is invalid
<OSM> All threads completed. (succeed 0 / failed 1)

Searched around for solutions but with no luck. Anyone kindly give some suggestions?
Odin is 3.12.4
T-Mobile firmware is N930TTMB1APGC_N930TTMB1APGC_TMO
AT&T firmware is N930AUCS1APH1_N930AATT1APH1_ATT_FULL
The verison I tried to flash back is AP_N930VVRS1APH1_CL8720001_QB10528330_REV00_user_l ow_ship_MULTI_CER

Also, I'm still in the 14 days return period. Anyone has an idea if they'll allow me to return the device after I flashed the AT&T firmware on it?
(went to a Verizon store asking for help but they told me "we don't flash things")

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