preparing iMac for sale
Does resetting NVRAM remove the wifi preferred networks and passwords, and paired blue tooth devices?
iMac Line (2012 and Later)
You need to do this before selling: What to do before you sell, give away, or trade in your Mac - Apple Support
With respect to nvram:
"Settings that can be stored in NVRAM include sound volume, display
resolution, startup-disk selection, time zone, and recent kernel
panic information. The settings stored in NVRAM depend on your Mac and
the devices that you're using with your Mac."
See: Reset NVRAM or PRAM on your Mac - Apple Support
