Got a New Nexus 7 (2013) modal, and it was stuck on the X logo forever, it’s fully charged.
my firs try is to restore to the factory image, however, no official image for “flo” the New nexus 7 in the Google page.
it only have the old one
after did a lot Goggling, found this one works
fastboot boot recovery.img
then clear cache, install the zip for sdcard or sideload
then it will works, Good luck