Uninstalling pre-installed apps

I just got a MID/Flytouch 3 10" tablet. I also have a 7" that has been pretty easy to work with. The new 10" tablet has Dolphin Browser HD installed but it is a very old version (4.x?). I tried to run the update through my AndroidPIT App Center on the tablet. It downloaded the update OK. It starts the install and almost finishes and then the install fails. I have gone into the application settings and tried to uninstall Dolphin Browser but I don't get that option, it is grayed out. Any idea on how I can apply the update and/or uninstall pre-installed apps on this tablet? There are some other pre-installed apps (Angry Birds) that I would like to uninstall.

Yeah, really old version of Dolphin, that is one reason why I was trying to upgrade it. Also, would want to keep up with the latest updates over time. I ended up returning this tablet. I had too many issues with it. The root was not good in my opinion. There were several apps besides Dolphin that were pre-installed (Adobe Reader) that I would want to keep up to date that couldn't be updated since they were pre-installed. Why would they put something in the root that is readily available from the market for free? Also, the market always thought I was in China (which I'm not - US) so I couldn't download several apps that I should've been able to download. Not worth the hassle so I returned the tablet. They need to get somebody to provide a better root before they sell these on eBay! I am a computer professional so I should be able to root the tablet but I really have no desire to do that.