Admin. Can’t be changed and won’t allow for new password set up get 404 error.
WIFi working great although won't download any app updates. Senses error 404 message.
It sounds like a double-nat situation. when you moved to a new broadband provider, did they set you up with a modem/router combo? What is the model and firmware of this device? If it is a combo device look through this thread: https://community.netgear.com/t5/Orbi/Orbi-RBR50-404-Not-Found/td-p/1665348
It walks through setting someone with a combo device up and has lots of valuable info on a novice being walked though this. its not all important but there's a lot of good information in the thread.
If it is a combo device your options are:
1. Leave the device as is and switch your Orbi to AP mode.
2. On the provided device, turn on bridged mode/modem only mode. Best way to do this is contact your provider and have them walk you through how to set their device in this mode.
If its not a combo device and is a modem only device, I'd first try resetting your Orbi to remove any old settings from prior provider. Then starting fresh, have all devices off, turn on modem, wait a couple minutes for it to fully initialized and connect, then boot the Orbi and set it up new.