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Enable APP Protection Fails

Hi,

I'm working on enabling APP Protection while successfully executing below code:

if (!nrf_sdh_is_enabled()) {
     if (VERSION_BUILD <= MAX_RELEASE_BUILD) {
         NRF_UICR->APPROTECT = 0xFFFFFF00;
     }
   }

Please advise why I'm still able to read out the flash afterwards via the SWD interface.

Best Regards,

Ronny