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ADRF6807 doesn´t  save configuration registry

Hello,

 

I have the evaluation board of adrf6807, energized in the following way:
connected 5v to VCC and 3.3v to 3P3V_FORCE, but when uploading the registers and then turn off the equipment.

I must have the configuration done again, the registers aren´t saved in the memory.

 

Why?