Use powershell to elevate and Fix setting and testing against errorlevels

Author: pal1000

FWUpdate.bat

@@ -1,32 +1,12 @@
 @echo off
-
-:: BatchGotAdmin
-:-------------------------------------
-REM  --> Check for permissions
-    IF "%PROCESSOR_ARCHITECTURE%" EQU "amd64" (
->nul 2>&1 "%SYSTEMROOT%\SysWOW64\cacls.exe" "%SYSTEMROOT%\SysWOW64\config\system"
-) ELSE (
->nul 2>&1 "%SYSTEMROOT%\system32\cacls.exe" "%SYSTEMROOT%\system32\config\system"
+@cd /d "%~dp0"
+@set "ERRORLEVEL="
+@CMD /C EXIT 0
+@"%SYSTEMROOT%\system32\cacls.exe" "%SYSTEMROOT%\system32\config\system" >nul 2>&1
+@if NOT "%ERRORLEVEL%"=="0" (
+@powershell -Command Start-Process ""%0"" -Verb runAs 2>nul
+@exit
 )
-
-REM --> If error flag set, we do not have admin.
-if '%errorlevel%' NEQ '0' (
-    echo Requesting administrative privileges...
-    goto UACPrompt
-) else ( goto gotAdmin )
-
-:UACPrompt
-    echo Set UAC = CreateObject^("Shell.Application"^) > "%temp%\getadmin.vbs"
-    set params = %*:"=""
-    echo UAC.ShellExecute "cmd.exe", "/c ""%~s0"" %params%", "", "runas", 1 >> "%temp%\getadmin.vbs"
-
-    "%temp%\getadmin.vbs"
-    del "%temp%\getadmin.vbs"
-    exit /B
-
-:gotAdmin
-    pushd "%CD%"
-    CD /D "%~dp0"
 :--------------------------------------
 set fwupdate=FWUpdLcl
 if "%PROCESSOR_ARCHITECTURE%"=="AMD64" set fwupdate=%fwupdate%64