NR5103E firmware

The router is bought at tre.se (Sweden) the internet provider.

I still have the router today but I have changed internet provider to Telia.

Tre is the one providing firmware updates and i have to have tre to get updates.

I have an issue where there is practically zero 5G at my router where it is. If i have my cellphone next to the router i get 150Mb/s at 5G.

My only hope i that a firmware can fix this.

Is there a way to get the update somewhere else?