It should be safe to power off ... Then remove the SD card with the update bin file ...

Power on - let it fully boot and Restore Defaults again ...

Then insert SD card with update bin file ...

Answer yes to 1st question ...
Answer No to 2nd question ...

Wait for unit to update and reboot itself ...

You should then get a popup that says "No Update necessary" ... Remove SD card ...

Restore Defaults again ...

Rickie