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How to perform a factory reset of nrf52840?

Hi everyone,

This might seem like a silly post, but this happened.

I build and ran the example QSPI code given in the sdk. 

But after that if i try to run my own code of freertos along with BLE. It just doesn't run and it freezes.

I think i erased some important part of the memory, Can anyone suggest me how to proceed for this kind of problem?

If i press the reset button on the nrfPDK ,it runs the previous code that was uploaded and not the current one.

This is very weird problem i had ever faced.

I  didn't make any changes to the sdk example, I ran that code as it is.

Thanks

Rajat.

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