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You can only unlock the panel with push buttons by performing a factory default:

 

Hold DOWN button and press MODE button twice - page 35 of XR Manual from June 2018

 

Take care, this makes a factory default and all paremeters changed from default will need restoring.

 

Otherwise via an ASCII command J=U

 

Or XF (factory default)

 

Also in DTMD 5.4.1 you must close the software before disconnecting the sensor as the software unlocks the panel.