Something change on the TC-1797 ?
Boot loader doesn't load or fails part way through, read will fail, have to restart, reflashing that last minute (yikes)...yesterday
it took 4 hours to successfully reflash.
On a 2013 I did, I had to pull the HID fuses, then got a good write (finally).
Haven't had this problem since the very first 2014 5.0L pickup which led to a crapped ECA.