Are you in the US ? if yes, it could have somehting to do with the adapter. As far as I know, there has been no problem with bootloops for us europeans, so my guess is that the AC adapter is faulty, not the device nor the FW.
Here
http://blog.the-ebook-reader.com/201...boox-t68-lynx/ a very interesting point made by Kannon (4th comment), which I believe to be the cause indeed.