https://devzone.nordicsemi.com/f/nordic-q-a/116367/52840dk-fw-size-confusingDear all: I found that the nrf52840 flash size is only 1MB, but the size of light bulb load is about 850KB, I have some questions: 1. Does it contains the FOTA region? If yes, what is the size of the FOTA region? 2. If binary doesn&#39;t include FOTAen-USTelligent Community 13Fri, 15 Nov 2024 03:38:33 GMThttps://devzone.nordicsemi.com/thread/510589?ContentTypeID=1Fri, 15 Nov 2024 03:38:33 GMT137ad170-7792-4731-bb38-c0d22fbe4515:55277ebd-c193-4628-b219-28c0407c9dabsusepc<p><a href="https://devzone.nordicsemi.com/members/ahaug">AHaug</a>&nbsp;</p> <p>&nbsp; &nbsp; &nbsp; &nbsp; Got it, thx a lot!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/510478?ContentTypeID=1Thu, 14 Nov 2024 12:40:43 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1d3ea82d-198e-471b-b100-1cf20337e0baAHaug<p>Hi,</p> <p>I assume you are referring to the Matter Light bulb sample. Is this the case?</p> <p>If so, yes, the sample without optimization is this large. You can see some memory footprints here:&nbsp;<a href="https://docs.nordicsemi.com/bundle/ncs-2.8.0-preview1/page/nrf/protocols/matter/getting_started/hw_requirements.html">https://docs.nordicsemi.com/bundle/ncs-2.8.0-preview1/page/nrf/protocols/matter/getting_started/hw_requirements.html</a>. For Light Bulb in release configuration it is 755kB.</p> [quote user=""]&nbsp; &nbsp; &nbsp; 1. Does it contains the FOTA region? If yes, what is the size of the FOTA region?[/quote] <p>No, this is not included the FOTA region.</p> [quote user=""]2. If binary doesn&#39;t include FOTA region, 1MB flash in nrf52840 seems not enough to do FOTA, how to implement FOTA？[/quote] <p>For DFU in Matter devices, an external memory flash device is required.</p> <p>Kind regards,<br />Andreas</p> <p></p><div style="clear:both;"></div>