I just installed 20.05.2 on NETGEAR R6300V2 and radio1 does not exist. also tried .1. I am not sure If I am missing something on the install or if there is a problem. With the standard NETGEAR firmware both radio0 and radio1 show up.
Any help/explanation would be appreciated.
What it says
Although OpenWrt does run on the R6300 v2 only 802.11g is supported, Broadcom 802.11an support is very sketchy on OpenWrt in general; Broadcom 802.11ac support is non-existent. Kindly direct your complaints to Broadcom, not to the OpenWrt developers or community :).
On your router's page.
fwiw, you would be better running FreshTomato or ddwrt on the R6300v2.
https://freshtomato.org/
You can use nmrpflash to restore Netgear firmware.