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Instructions have been moved to https://github.com/francoism90/asus-router. :)
I am a complete beginner in the field, but I think I was able to increase my signal as well on my RT-AX92U
running 3.0.0.4.388_23630-g9d6ee22, I have set nvram as per:
admin@RT-AX92U-95D0:/tmp/home/root# nvram dump | grep 'country|code|location|txpower'
1:ccode=ALL
2:ccode=ALL
3:ccode=ALL
ddns_return_code=,200
ddns_return_code_chk=,200
size: 83778 bytes (47294 left)
fb_country=
location_code=#a
modem_country=
modem_pincode=
modem_pincode_opt=1
oauth_google_auth_code=
rc_support=mssid 2.4G 5G update usbX2 switchctrl manual_stb 11AX pwrctrl WIFI_LOGO nandflash movistarTriple wifi2017 app ofdma wpa3 reboot_schedule ipv6 ipv6pt s46 ocnvc PARENTAL2 dnsfilter dnspriv dualwan pptpd openvpnd utf8_ssid printer modem webdav rrsut cloudsync media appnet timemachine hdspindown diskutility dnssec usb_bk frs_feedback dblog email 5G-2 bwdpi wrs_wbl ookla HTTPS letsencrypt ssh vpnc vpn_fusion repeater psta wl6 user_low_rssi tcode usericon cfg_wps_btn stainfo cloudcheck realip lacp wanbonding wtfast ifttt alexa ipsec_srv mumimo netool cfg_sync no_finiwl fupgrade afwupg betaupg amas bcmwifi bcmhnd mbo conndiag eula proxysta iperf3 gn_wbl amazon_wss account_binding gameMode wireguard ftp_ssl acl96 dhdlog dis11b smart_connect
secret_code=22774156
territory_code=UK/01
wl0_country_code=ALL
wl0_country_rev=0
wl0_txpower=300
wl1_country_code=ALL
wl1_country_rev=0
wl1_txpower=300
wl2_country_code=ALL
wl2_country_rev=0
wl2_txpower=300
wl_country_code=#a
wl_country_rev=0
wl_txpower=300
admin@RT-AX92U-95D0:/tmp/home/root# wl txpwr_target_max
Maximum Tx Power Target (chanspec:0x100e): 25.00 25.00 25.00
But I think location_code was the one that actually affected txpwr_target_max and had it increased from 15.25 to 25 dBm, and this also seems to be persistent. wl*_country_code are just set by the value of location_code.
Ubiquiti WiFiman also states 25 dBm, and I get the impression that my connection in the, from the router, most remote room has improved.
