https://devzone.nordicsemi.com/f/nordic-q-a/15370/can-t-erase-nrf51-flashI need to save data to flash on an nRF51422. I already have same basic thing working on an nRF52, so I figured the same API calls would work, but they don&#39;t. My main symptom is that sd_flash_page_erase() always returns NRF_ERROR_FORBIDDEN no matter whaten-USTelligent Community 13Mon, 08 Aug 2016 11:31:38 GMThttps://devzone.nordicsemi.com/thread/58719?ContentTypeID=1Mon, 08 Aug 2016 11:31:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:bae081d7-b67a-4446-be38-436dde57c09ePetter Myhre<p>The nRF51 has a page size of 1kB.</p> <p>With S130 v2 pages 0-108 will be protected, and sd_flash_page_erase() will return NRF_ERROR_FORBIDDEN.</p> <p>The nRF52 has a page size of 4kB.</p> <p>With S132 v2 pages 0-27 will be protected, and sd_flash_page_erase() will return NRF_ERROR_FORBIDDEN.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/58718?ContentTypeID=1Wed, 27 Jul 2016 15:45:13 GMT137ad170-7792-4731-bb38-c0d22fbe4515:45a53bf8-c488-4cca-946e-aaedba11d8f6Elias<p>I wrote a loop that tries all of them, 0 to 64, with the intent that the program doesn&#39;t complete. On the 51, I always get FORBIDDEN (0x000f), so it actually does complete. On the 52, the same loop kills the program as expected.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/58717?ContentTypeID=1Wed, 27 Jul 2016 09:30:10 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0eed44ab-7c20-4360-a2b3-7e633e51ea97Petter Myhre<p>What pages have you tried?</p><div style="clear:both;"></div>