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my name is Billy.
I am very sorry but it is appeared your question stumped some the experts here. I know you may have already had this taken care of but when I saw it was still open I wanted to at the least acknowledge your query.
This thermostat opens by removing 2 small screws in bottom corners shown here.
If you have already had this taken care of - I apologize.
I realize you deserved an answer much sooner and I am very sorry for the delay.
Let me know if this is not useful