DRM isn't a format, it's a sort of security key added to the ePub (or other format). If your reader doesn't support it, the only way to use it is to strip the DRM.
I'm sorry, but there simply isn't another way if you can't get a reader that can handle DRM. It's not a Calibre or Adobe issue, it's your device.
Stripping DRM is easy, but we're not allowed to discuss it on the forum. A couple of searchers should find you enough info though. By suggesting stripping of DRM I'm not in any way suggesting piracy, illegal file sharing or anything like that of any kind. Just a tool for you to get you legal books copied to your device.
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