If it still says "contents are in disagreement," try reading the chip contents to a file, opening that file in a Hex Editor, and seeing if it is just FF FF FF or 00 00 00 . If so, you likely have a bad connection or a dead chip.
Help!chip main memory with the contents are in disagreement! If it still says "contents are in disagreement,"
Switch to more robust, community-verified software. If it still says "contents are in disagreement,"