NRF51822 -Reset factory-memory layout

I purchased a module that I encountered during startup. At first I programmed the module via the ST link v2.

Example: E: \ nRF5_SDK_11.0.0_89a8197 \ examples \ peripheral \ blinky \ pca10028 \ s130 \ arm5_no_packs


before programming, Bluetooth was not visible to other devices. After programming, it was not visible to other devices

How can I get the chip back to factory settings with ST Link v2?

Because I feel the memory of the layout is messed up

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