If you loaded a preset it's totally fine that you see everything locked, presets are not meant to be modified. You still have the input eq to operate freely.
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If you want to reset the amplifier please drag in the workspace the equivalent virtual model from the model list, than right click>device>copy and right click>device >paste on the real one.
That didn't help. When I click on Limiter Settings - everything is locked there. In the Preset Locking there are 4 fields for password entry: Genereal Preset, DSP Common Preset, Channel 1 and 2. I can only unlock General Preset with a password that I created in the password "1".