I tried to download the new lolipop on my Nexus 4. After it was installed it said restart and complete download, so i did this. It is now stuck on the spinning dots and has been like this for the past almost 24 hrs. I know that I can possibly do a factory reset but this will get rid of over 2500 pictures and videos i have saved on the device and I would like to avoid this action at all costs. Any help would be appreciated.