@SodaDrama 

Hi, thanks for posting question here.

Hardware version can not be changed, as hardware usually is fixed and can not be changed.

Firmware can be updated but yours has been the latest.

From its specifications, we can see 1201 Mbps at 5 GHz, 574 Mbps at 2.4 GHz, which is maximum wireless signal rates/negotiatied speed

I can understand your worries,  but maximum wireless signal rates are the physical rates derived from IEEE Standard 802.11 specifications. Actual wireless data throughput and wireless coverage are not guaranteed and will vary as a result of 1) environmental factors, including building materials, physical objects, and obstacles, 2) network conditions, including local interference, volume and density of traffic, product location, network complexity, and network overhead, and 3) client limitations, including rated performance, location, connection, quality, and client condition~