https://devzone.nordicsemi.com/f/nordic-q-a/24067/completely-wipe-flashHi, Does the erase target in the makefile completely erase the flash? I&#39;m having strange errors when trying to read the flash (i.e. I can&#39;t read anything from flash, even though I could a couple days ago.). I want to make sure the problem is with myen-USTelligent Community 13Fri, 04 Aug 2017 08:04:27 GMThttps://devzone.nordicsemi.com/thread/94776?ContentTypeID=1Fri, 04 Aug 2017 08:04:27 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c2aec1a4-0d23-4036-a72a-706bd8a1625bRoger Clark<p>Thanks Bjørn</p> <p>BTW.</p> <p>I think @q changed their question.</p> <p>But in case they want to erase the whole of flash memory they can use</p> <p>nrfjprog --erase</p> <p>Re: Makefile .</p> <p>make flash does not erase all flash, it only does the pages needed for the application</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/94775?ContentTypeID=1Fri, 04 Aug 2017 06:31:23 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8e3c321b-f4fd-4816-a93e-3daec5fd5cc9bjorn-spockeli<p>@rogerclark: The nRF Commandline Tools (nrfjprog, mergehexand the nrfjprog DLL) are available for <strong>Windows</strong>, <strong>Linux 64- and 32-bit</strong> and <strong>Mac OS X</strong>. You can download the tools for your respective OS from <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.tools/dita/tools/nrf5x_command_line_tools/nrf5x_command_line_tools_lpage.html?cp=5_1">this</a> Infocenter page.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/94774?ContentTypeID=1Thu, 03 Aug 2017 23:11:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c30e0507-4614-4b74-9248-8d4b2d7d10d9Roger Clark<p>You have not said what OS etc you are using, but on Windows you can use</p> <p>Nrfjprog to erase the whole MCU</p><div style="clear:both;"></div>