Hi m0bov
Sorry to see you are having problems with the migration to TV360.
There are a couple of things you can try to complete the process.
You could try turning off the V6 by the switch on the back of the box; then on the front of the V6 box hold down both the power button and the - button at the same time. Then turn on the V6 again whilst keeping hold of those buttons for a further 30 seconds.
If the power button and the - button workaround doesn't solve it then try using the power button and the + button at the same time instead.
Some people with this error have also managed to perform the update by either removing the box from the mains for five minutes and trying again, or by deleting a few recordings to make more space and then trying again.