Dingoonity.org

Hi, I previously owned a Dingoo A320 and got a bit nostalgic, so purchased a second hand one from eBay.

What I'd like to know, is if there's a definitive way to reset to factory settings and format the internal memory?
Should I just delete unnecessary files (if so, is there any I should categorically NEVER delete?)

I've got some questions about OpenDingux as well, but I'll see if these get answered first, haha.

I don't have a Dingoo A320, but in this thread there is a link posted to a Wayback machine archive of the wiki:

https://boards.dingoonity.org/dingoo-hardware-general/dingoowiki-down!/

https://web.archive.org/web/20110210145512/http://dingoowiki.com:80/index.php?title=Main_Page

Use google to search these forums using site:boards.dingoonity.org as your first search term.  That's how I found the above link.  You also might try asking in #gcw channel on Freenode IRC.  Give people in IRC plenty of time to respond, they come and go at various hours of the day.