You can convert to .mobi via Calibre and side-load the books. Not sure how well the kindle will handle collections of side-loaded books (I don't own a Kindle).
If you want to continue using epub, check the FW and DONT turn wifi on. If it is 5.6.x, you will not be able to install any kind of hacks as you have done on your existing Kindle. If it is lower than 5.6.x, keep wifi OFF and install jailbreak (read these forums carefully).
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