Download Android 2.1 for Droid Eris

Android developers has released Android 2.1 ROM for Motorola Eris users which is either not an official release but it has approximately all the features like original except few.

See also:
Download Android 2.1 for Motorola Droid
Android 2.1 for Droid Eris is available for download on xda developers forum with full installation instructions but you must keep this in mind that it is not an official release so it may brick the mobile and the other recommendation is that only the expert users should try this leaked Android 2.1 otherwise you may caught in problems.

Download Android 2.1 for Droid Eris