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Try this sequence: UP>DOWN>NEXT>HOLD>the Rotary Dial>RESET BUTTON
You did not list this sequence (no dial). Rotary dial means turn the dial. This is the sequence that's spelled out in the manual for your thermostat. If you'd like I can post a link to the manual.
Sounds like you have a defective thermostat. That's the unlock sequence in the manual. If the dial won't move then you'll probably need to replace the thermostat
Glad you worked it out