https://devzone.nordicsemi.com/f/nordic-q-a/127712/gd25wb256-alternative-firmware-changes-nrf9151-external-flashHi, I’m using GD25WB256 as external flash on nRF9151 for MCUboot secondary slot. It’s currently not available from our supplier, so I’m looking for alternatives. Current overlay: Questions: What are good 256Mbit SPI NOR alternatives (preferablyen-USTelligent Community 13Tue, 07 Apr 2026 13:05:10 GMThttps://devzone.nordicsemi.com/thread/564528?ContentTypeID=1Tue, 07 Apr 2026 13:05:10 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3ecdb893-a949-4398-a41e-7a8e4b407df6Hung Bui<p>Hi Akshay,&nbsp;</p> <p>We won&#39;t be able to give you a specific recommendation for an alternative to GD25WB256. The NCS SDK is&nbsp;highly agnostic to a specific flash chip.&nbsp;Any modern QSPI flash will be &quot;plug-and-play&quot; once you update the JEDEC ID and size in your Devicetree. We are not supposed to give any &quot;favorite&quot; flash chip/ manufacturer that you should use.&nbsp;<br /><br />As far as I know, you just need to use the correct JDEC ID and correct size in the device tree overlay you should be fine.&nbsp;</p> <p></p> [quote user=""]Anything to watch out for (4-byte addressing, SFDP, etc.)?[/quote] <p>Not that I&#39;m aware of, AFAIK you just need&nbsp;<span>enter-4byte-addr = &lt;</span><span>0x01</span><span>&gt;; &nbsp; &nbsp;</span>&nbsp;defined in the device tree overlay.</p><div style="clear:both;"></div>