How to uninstall SEP Client with password using SEPprep

Hi,

I have a group of clients who are unable to update content from the sepm through GPU ( noconnection issue and tests between client- GUP - SEPM were successful). I am trying to remove the SEP client 12 and the reinstalling it using SEPprep.

Below is the SEPprep I'm trying to use:

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[Settings]
ShowGUI=N
ShowMessageBox=N
MessageBoxText=Prepairing your system for Symantec Endpoint Protection 12.1.  During this process other antivirus products will be removed.\n\nIf you are prompted please fully remove these products.
AutoRunAfterUILoads=Y
AskBeforeRemoval=N
SilentMSIInstaller=Y
RemoveSymantec=Y
CheckDiskSpace=Y
ResumeAfterReboot=Y
EnableLogging=Y
LogPath=%temp%
MSIExtraParameters=PASSWORD="mypasswd"
RunBeforeRemoval=
RunAfterRemoval=SEPsetup.exe

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Below the errors:

07/02/2015 14:11:13:049 SEPprep starting!
07/02/2015 14:11:13:159 Removing: Symantec Endpoint Protection
07/02/2015 14:11:13:174 Attempting to run: MsiExec.exe /X{A84E6630-FE81-4D1F-BBA0-4BFBCC1D9493} REMOVE=ALL REBOOT=R /qn PASSWORD="mypasswd"
07/02/2015 14:11:14:112 Exit code: 1602
07/02/2015 14:11:14:112 Failed to remove Symantec Endpoint Protection
07/02/2015 14:11:14:112 Removing: Symantec Endpoint Protection
07/02/2015 14:11:14:112 Attempting to run: MsiExec.exe /X{A84E6630-FE81-4D1F-BBA0-4BFBCC1D9493} REMOVE=ALL REBOOT=R /qn PASSWORD="mypasswd"
07/02/2015 14:11:14:784 Exit code: 1602
07/02/2015 14:11:14:784 Failed to remove Symantec Endpoint Protection
07/02/2015 14:11:15:096 Attempting to run: SEPsetup.exe /s /v"/qb! /l*v "C:\Windows\TEMP\\SEP_INST.LOG" REBOOT=ReallySuppress"

Thanks for your help.