flash 4.4.3 FTF
complete setup wizard and then go to settings enable development option and enable usb debugging mode
then connect phone and authorize USB access.
now turn off phone and flash 4.4.2 kernel and follow further instruction
I have a T2 Ultra D5303 4.4.3, but I can't download Require file.rar because Dev-Host sucks and the download page times out. Is there a mirror? Thanks!