My nexus 7 is stuck in a boot loop. All i can see is the nexus logo. I tried a hard reset,it worked for a day then im back again stuck in boot loop. The hard reset doesn't work anymore. I bought this device on ebay.us,but i live in europe,and i can't ship it back because US post services dont accept lithium powered devices. I really dont know what to do now. I hope this is a software issue and somebody here can help me fix it. I haven't rooted it.