https://devzone.nordicsemi.com/f/nordic-q-a/67245/to-meet-security-compliance-can-deleted-files-get-recovery-in-nrf51822hi all A silly question here , I am prepare to meet some security compliance , one of them is about delete files permanently. I wonder how to get this done on nRF51822? Maybe I should ask this in another way. Is there is anyway to recovery the deleteden-USTelligent Community 13Thu, 15 Oct 2020 12:52:55 GMThttps://devzone.nordicsemi.com/thread/275095?ContentTypeID=1Thu, 15 Oct 2020 12:52:55 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ffc512cf-af83-478d-98b4-909b71e09b55iotdev123<p>Your reply had answered my question.</p> <p>Thank you Sir.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/275094?ContentTypeID=1Thu, 15 Oct 2020 12:51:12 GMT137ad170-7792-4731-bb38-c0d22fbe4515:58774a99-c7a4-4601-9518-5a535afaa6eeawneil<p>Erasing flash does physically erase the memory contents. It&#39;s not like deleting a file in a file system which, typically, just removes the entry from the &quot;index&quot; - leaving the data physically present on the storage medium.</p> <p>Whether it&#39;s possible to determine &quot;previous programmed value&quot; with, say, a scanning electron microscope after de-capping the chip - I don&#39;t know.</p> <p>What level of attack are you trying to protect against?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/275089?ContentTypeID=1Thu, 15 Oct 2020 12:46:41 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ea2649ce-d911-4137-b044-5f512232b57ciotdev123<p>the Flash memory I mean&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/275083?ContentTypeID=1Thu, 15 Oct 2020 12:35:43 GMT137ad170-7792-4731-bb38-c0d22fbe4515:55933e18-f131-43e5-8c69-0dd934c9c859awneil<p>What &quot;files&quot; are you referring to?</p> <p>The nRF51822 itself does not have any file system</p><div style="clear:both;"></div>