The device is stuck in a boot loop, it boots up, crashes, reloads and repeats. Unless you already have a backup it's fairly probable that you won't be able to get your data back. Sorry, that's just the way nightly builds work :(
If you want to go back though, you'll have to re-flash the v18D_nightly_v4 base image and then manually shallow_flash yesterday's master build. Hope I've helped. _______________________________________________ dev-fxos mailing list [email protected] https://lists.mozilla.org/listinfo/dev-fxos

