Clean removal of system apps

Here are steps to Clean removal of system apps (bypass error 0x80073CFA) :

1. Try removing the system package using Remove-AppxPackage
   
2. Run cmd as SYSTEM using PsExec (https://technet.microsoft.com/en-us/sysinternals/bb897553.aspx) in an elevated command prompt psexec -i -s cmd
3. Copy %ProgramData%\Microsoft\Windows\AppRepository\StateRepository-Machine.srd to the Desktop (do make a backup)

   copy %ProgramData%\Microsoft\Windows\AppRepository\StateRepository-Machine.srd %USERPROFILE%\Desktop
   

4. Toggle IsInbox to 0
   
5. Kill sihost.exe and the svchost.exe instance that shares the same PID as the StateRepository service (cannot be stopped via usual methods)

   taskkill /im sihost.exe /f
   FOR /F "usebackq tokens=2 skip=2" %i IN (`tasklist /svc /fi "services eq StateRepository"`) DO taskkill /PID %i /f
   

6. Ignore the warning window, note that Start Menu will not work until reboot
   
7. Delete %ProgramData%\Microsoft\Windows\AppRepository\StateRepository-Machine.* (including the SQLite temp files). This would not work until step 5 is done properly.

   del %ProgramData%\Microsoft\Windows\AppRepository\StateRepository-Machine.*
   

8. Copy the edited StateRepository-Machine.srd to %ProgramData%\Microsoft\Windows\AppRepository\

   copy %USERPROFILE%\Desktop\StateRepository-Machine.srd %ProgramData%\Microsoft\Windows\AppRepository\
   

9. Restart the StateRepository service and try removing the system package again

   sc start StateRepository
   

   

10. Reboot to restore the Start Menu