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A 2000 Boxster does not have the MOST system. (I have a 2000, so I can make that statement based on experience.)
Updating a non-MOST system is much more straightforward than what the folks with MOST have consider. When I have time later today, I will post some links that provide instructions for upgrades. I currently have a GPS system in my Boxster, but in the other vehicles we own, I have installed Apple Carplay and Android Auto compatible units. I prefer those to the system in my Boxster.
I believe the reason your current system is not retaining the settings is because it is wired incorrectly. Head units have two power connections. One is wired to the lead that has constant power. The other is wired to the lead that has power when the car is on. The person who installed your unit only connected it to the lead that has power when the car is on.
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2000 Arctic Silver/Black, Hard Top, On Board Computer
PNP Rear Speakers, HAES 6-Channel Amp, Avic Z140BH,
Painted Bumperettes, 2004 (OEM) Top, Homelink integrated in dash with Targa switch, 997 Shifter, Carrera Gauge Cluster with silver gauge faces, heated 12-way driver & 8-way passenger seats, Litronics, silver console
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