Despite what you say, it should be possible to release it and pull it out far enough to see the label. there should be a pair of small holes to the right and left of it. You need a pair of small tools to release it - like these: tinyurl.com/y5g8b7wq
Before doing that, have you tried pressing (and holding) buttons 1 & 6, or 2 &6 and seeing what numbers come up? You may see V or M plus six digits - allow the display to cycle through various numbers.
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