I have been using TRB145-s with private APN-s since a couple of years now, so I know how to set them up. But with the latest firmwares, I am not able to enter the name of the private APN. I set Auto APN to off, go to the APN list, I push “+ Add new”, but it only displays Add"" and a button, and it does not allow to actually enter the name of the APN. What do I do wrong?