I've got an Archer C60 (AC1350) TP-Link router. I'd like to be able to control the output power. Under Wireless Function, there's a setting for output power as Low, Middle, or High. I guess "High" corresponds to 20 dBm for 2.4 GHz WiFi and 23 dBm for 5 GHz WiFi. Does anybody know what power levels "Low" and "Middle" are?

I wish there were more power steps you could choose from, that prefarably show quantitative levels as well (for example, 20%, 40%, etc.), not descriptive words like Low or High. Is there any FW update out there for the above router?

Thanks.