Can i calculate the bluetooth signal strength on arduino?

sorry if too wordy, my bad

You could ask them:
image

Or consider:
image
which looks way older than yours.

You could try googling your version number

You don't seem to understand that different firmware could be loaded into the same hardware - and they may work differently.
Also, there could have been hardware revisions - which could make a difference.

Again, why don't you show what you actually sent to the module, and what it replied with?

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