I dont know how to solve the actual reboot loop but what I have done to get my phone to be picked up by the flasher is this: 1.Boot Linux (Gentoo in my case) 2.Start flasher tool, it will say "cant find USB device" 3.Remove battery from phone, ensure phone is 100% powered down 4.Connect USB cable to phone 5.Insert battery When I did those steps, it booted and the flasher found it no problems.