Just a little more FYI, you can also disconnect the battery to circumvent the hour wait time.
And yes, to reinstall the factory unit you have to have the code, which can only be obtained by giving the dealer the serial number. This number should be listed in the owners manual, if the car still has it.
<span style='color:gray'><span style='font-family:Courier'>1995 e36 3 Series RIP
1999 e46 3 Series BURN IN HELL
2000 MR-S Roadster= Current</span></span>
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