I’ve just tried it myself with Web IDE and it works fine, but if you experience issues, it might be due to the time the Core needs to reconnect to the cloud after the reset, since all this time will be taken off the
3 * SOFTDELAY (30sec) that seem to suffice with my WiFi and internet connection.
Just for testing, you could increase the factor from
3 to whatever number that works for you.
As a side not - once the Core starts breathing cyan, you may want to wait one or two seconds before pressing the flash button on the Web IDE, then the Core should start flashing magenta “slowishly” and after max 25sec it should turn into rapid magenta flashing. If this rapid phase is not coming, you definetly have to increase the flash delay.