Device protection

When trying to flash the NRF Bootloader via OpenOCD, i got this error from command line:

nRF52 device has a CTRL-AP dedicated to recover the device from AP lock.
A high level adapter (like a ST-Link) you are currently using cannot access
the CTRL-AP so 'nrf52_recover' command will not work.
Do not enable UICR APPROTECT.

How can i do to remove the protection?

Thank you.

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