I have questions on aftermarket car audios, Oppo

I don’t know a lot about his topic so looking for some help. My current infotainment system looks like this-

Illustration for article titled I have questions on aftermarket car audios, Oppo
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It’s a relic from 2007 - 7" touchscreen with Navigation. I play music from a USB, but I use my Android phone on a vent-attached holder for Navigation and streaming through Bluetooth that doesn’t sound all that good. I was looking up aftermarket units specifically at Best Buy (I read they install for free) and I am seeing units from $299 to $999. I really like Android auto and that is all I need. I’d go for a cheaper option with no navigation and smaller 7" screen to fit in the current console. Something like this-

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Questions:

1. Will the new unit overwrite the original OS and screens or can I still access them?

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2. Will putting an aftermarket system hurt the resale value? I mean it’s no Toyota Tacoma but I don’t want it affect it too much. I plan to keep the car for a couple of years. Honestly though, I’d assume the next buyer would appreciate the upgraded infotainment with phone connectivity.

3. Will it increase the resale value by any chance? If I traded it in?

4. Has anyone had aftermarket audio installed at BestBuy? do they do a good job? One of our friends upgraded their car and they highly recommended it. or do I go independent Audio shop?