Netgear XR300


 * • 1300 Mbps - 3SS 5GHz 802.11ac (80MHz chan.),
 * • 450 Mbps - 3SS 2.4GHz 802.11n (40MHz chan.) = 1750 Mbps class


 * • Datasheet

"U12H332T78" is in the header of the firmware file that is available for download.
 * Broadcom chips are just a guess, for now.

This device is presumed to use BCM4360 + BCM4331 radios like
 * the Netgear R6700v3 / Netgear R6400 v2 since no MU-MIMO
 * or 256-QAM support is claimed in any currently available PR.