do your best to search the forums for those with a similar experience, but that is not right - try to do it via usb through the global menu when u get another chance - fwiw, there’s been no reports of things going terribly bad, but i wouldn’t wish to encourage you to pull the plug until you search or even contact support, even though i suspect you will be ok as you only reached the receiving stage as opposed to erasing/writing flash etc !!