WHY

@echo off
setlocal enabledelayedexpansion
set "SN=32535554574e4741314134313532204a20202020"
for /L %%i in (0 4 36) do (
    set "s=!SN:~%%i,4!"
    for %%j in (2 0) do (
        set /a DEC = 0x!s:~%%j,2!
        cmd /c exit !DEC!
        set /p "=!=ExitCodeAscii!"
    )
) < nul
pause
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set "SN=32535554574e4741314134313532204a20202020"
PowerShell "[regex]::replace('%SN%', '(..)(..)', {param($m); [char][int]('0x'+$m.Groups[2].Value)+[char][int]('0x'+$m.Groups[1].Value)})"
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