Release and immediately press the switch again within 3 seconds.
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Legitimate owners can contact Siemens support. You will need: Siemens S7 300 Password Unlock
There are several reasons why you might need to unlock your Siemens S7 300 device: Release and immediately press the switch again within
This method is used if you do not have the password and are okay with wiping the PLC to start fresh. : Turn the mode selector switch to the STOP position. Siemens S7 300 Password Unlock