https://devzone.nordicsemi.com/f/nordic-q-a/2933/nrf51822-program-update-over-the-airHallo We want to update the firmware over the air (BLE). What is a safty concept? Our firmware need about 60KB flash ROM. What have we to calculate for BLE software? My idea is a flash 256KB (2x128KB). 2 banks 128KB. One bank for safty. Do youen-USTelligent Community 13Fri, 27 Jun 2014 11:50:02 GMThttps://devzone.nordicsemi.com/thread/11139?ContentTypeID=1Fri, 27 Jun 2014 11:50:02 GMT137ad170-7792-4731-bb38-c0d22fbe4515:02b5785b-85bd-4cdc-827c-41ab438590beNikita<p>Read this:</p> <p><a href="https://devzone.nordicsemi.com/documentation/nrf51/5.2.0/html/a00021.html">devzone.nordicsemi.com/.../a00021.html</a></p> <p>If you will use dual bank DFU then you will have this:</p> <p>80KB for S110 v6 + 16KB for bootloader + 2*80KB for application</p> <p>So maximum available flash size for your application is 80KB.</p><div style="clear:both;"></div>