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Usually in a case where a function is completely inaccessible (apparently 'disabled' in its controls, or grayed out, etc.) and a reset does not fix it, the problem is in that the function is 'broken' or its hardware has become so defective that the controls being in place is no longer of any use (so they get grayed out) or the hardware / circuitry parts that do the function have failed to initialize.
Would you like to try a firmware update, in case the problem is rather that the firmware for Bluetooth control(s) has become corrupted?