• if you have android phone (or iphone) download nrfConnect from store, download stable firmware zip to phone, then hold watch button until it reboots and line is printed over screen, release button before it goes over, then it is in DFU mode, search in nrfConnect for DfuTarg device, click connect, then click DFU icon and upload the zip. You need to be quick as it does not wait in this mode for very long. If you are selecting zip and see on watch that it already boots then first reboot watch again in same way and then finish selecting zip, it may reconnect and start uplading.

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