If you need to access the logic without deleting it, these methods involve extracting the password from the Micro Memory Card (MMC). MMC Imaging Software : This is the most common "unofficial" fix.

These tools scan the image for the stored password string (up to 8 characters) and display it.

. Reviews for these methods are generally mixed, as they range from technical workarounds using hex editors to questionable software downloads. Overview of Common Methods

If you want, I can produce:

: Plug the MMC into a different S7-300 CPU with a different hardware configuration. The CPU will typically prompt for a memory card reset, allowing you to use the MRES switch to wipe it. Option 2: Extract Password from MMC (Keeps Program)