Im not all that tech savvy. But ive came a long way trying to create a hotspot without hotspot plan. Never had issues with my setup until trying to use plex service and xbox live to work so I can port forward the correct ports without a PC involved.

I can change the dhcp ip through wifi tether router app only first 3 subnets and I guess it always put 254 on the last one as dhcp. If I try use my phones actual dhcp it will not work so I use a custom one every time. Helps getting network connected to different routers a bit faster.

And when i try to setup router as repeater does not work in wisp mode. Only wds. So therefore i put 8.2 to be on same subnet as dhcp if i use routers 8.1 internet dont work. Ovpn file works fine if running on android or PC connected thru router