https://devzone.nordicsemi.com/f/nordic-q-a/4564/nrftoolbox-i-got-transfer-of-100156-bytes-has-taken-135793-ms-but-the-device-stay-the-same-system-i-can-t-update-itI use nRFToolbox to test my device. I got &quot;Transfer of 100156 bytes has taken 135793 ms&quot;,but the device stay the same system,I can&#39;t update it.en-USTelligent Community 13Mon, 24 Nov 2014 14:34:29 GMThttps://devzone.nordicsemi.com/thread/16179?ContentTypeID=1Mon, 24 Nov 2014 14:34:29 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a40df865-b4c4-4b88-8eda-3052a68db4bdStefan Birnir Sverrisson<p>Hi</p> <p>Can you please provide more information on what you are using and what your are trying to do.</p> <ul> <li>Are you transfering data with notifications, writes, or are you upgrading firmware with bootloader?</li> <li>What nRF51 SDK version are you using?</li> <li>What softdevice and what version are you using?</li> <li>What version of nRFToolbox are you using, and what profile? Android or IOS?</li> <li>What hardware are you using, what are the chip marking on the chip, what development kit and what version?</li> <li>What device are you using on the central side, Nexus 5, Samsung S4, Iphone 5S, ... ? Thanks</li> </ul><div style="clear:both;"></div>