Unable to sell my phone!!!!

I did a factory reset / cache partition wipe and sold it to a guy, now he is telling me that the phone says it is locked to my previous Google Account that was used to sign in to the device so I changed my password temporarily and gave him my email/password but when he signs in, it says that he needs to sign in using one of the owners accounts used on this device! but this is the account, I don't have any other Gmail account since 2 years

I then googled this problem and I saw many people experiencing the same issue and the solution was to load the OS again, so I downloaded Lollipop 5.1.1 from Sammobile but when I try to flash it it gets stuck on SetupConnection

please help now the phone is stuck on the Downloading page and since I cannot remove the battery, I can't even do a battery pull anymore!!!

But now I still cannot flash, here is what Odin says:

Initialzation..
Get PIT for mapping..
Firmware update start..
SingleDownload.
sboot.bin
NAND Write Start!!


==============================

did another reboot of the phone and tried again, now I get this:

Added!!
Enter CS for MD5..
Binary Check MD5.. Do not unplug the cable..
Please wait..
Checking MD5 finished Sucessfully..
Leave CS..
Odin engine v(ID:3.1100)..
File analysis..
SetupConnection..
Initialzation..
Get PIT for mapping..
Firmware update start..
SingleDownload.
sboot.bin
NAND Write Start!!
cm.bin
FAIL!

Complete(Write) operation failed.
All threads completed. (succeed 0 / failed 1)
============================================

This is the firmware I am trying to flash on my Galaxy S6 Edge+ 64GB International Version bought from Dubai:

G928CXXU1AOH3_G928COJP1AOH3_LYS

via xda-developers http://ift.tt/1Ovx37K

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