https://devzone.nordicsemi.com/f/nordic-q-a/1367/unable-to-write-to-flash-on-nrf51922I&#39;m unable to write my application code to the flash of an NRF51922 (QFAACAA). NRF Studio will let me flash the hex file but it fails verification. If I try programming in Keil I get an &quot;unable to erase chip&quot; error. I haven&#39;t had this problem with theen-USTelligent Community 13Thu, 16 Jan 2014 11:06:31 GMThttps://devzone.nordicsemi.com/thread/6206?ContentTypeID=1Thu, 16 Jan 2014 11:06:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2ae34fbb-5c3c-43c6-a960-0f450257ba6bOle Morten<p>That was unfortunately not a correct assumption, and I&#39;d recommend you to talk to your sales representative to get hold of nRF51422 revision 2 samples or kits as soon as possible.</p> <p>However, you should be able to at least flash your chip using Keil. If you get errors, I&#39;d recommend you to make sure that your IROM sizes are set correct in the project settings, that IROM starts on 0x20000 and not 0x14000. Errors here could also be the cause for nRFgo Studio having problems flashing the chip.</p><div style="clear:both;"></div>