spl23 Raspberry Pi Engineer & Forum Moderator Posts: 505 Joined: Fri Dec 26, 2014 11:02 am We have tested the following method to update from a card containing a vanilla Wheezy image (the latest version dated 5/5/15) to Jessie. This technique is not guaranteed to work on every modified image, but it should give a good starting point. We strongly advise that you BACK UP YOUR CARD BEFORE YOU START -