Change country to unlock channels, increase TX-power. (Use at your own risk)

ASUS RT-AC87U

# Login into router using SSH and execute listed commands (AT OWN RISK!).
# To apply the settings on boot, copy + paste the same settings in init-start.

# Backup current settings
nvram dump > dump.txt

# Set country + TX-power
nvram set asuscfe0:ccode=US
nvram set asuscfe1:ccode=US
nvram set asuscfe0:regrev=0
nvram set asuscfe1:regrev=0
nvram set asuscfecommit=1
nvram set 0:ccode=US
nvram set 1:ccode=US
nvram set 0:regrev=0
nvram set 1:regrev=0
nvram set wl0_country_code=US
nvram set wl1_country_code=US
nvram set wl0_country_rev=0
nvram set wl1_country_rev=0
nvram set wl0_reg_mode=off
nvram set wl1_reg_mode=off
nvram set regulation_domain=US
nvram set regulation_domain_5G=US
nvram set pci/1/1/ccode=US
nvram set pci/2/1/ccode=US
nvram set wl0_country=US
nvram set wl1_country=US
nvram set 0:maxp2ga0=114
nvram set 0:maxp2ga1=114
nvram set 0:maxp2ga2=114
nvram set 1:maxp2ga0=0x72
nvram set 1:maxp2ga1=0x72
nvram set 1:maxp2ga2=0x72
nvram set wl_txpower=500
nvram set wl0_txpower=500
nvram set wl1_txpower=500
nvram commit

# If changing 5G in the interface doesn't work:
# https://www.snbforums.com/threads/changing-channel-width-from-terminal.12432/
nvram set "wl1_chanspec=149/80"
nvram commit
service restart_wireless

Asus RT-AX58U

# Login into router using SSH and execute listed commands (AT OWN RISK!).
# To apply the settings on boot, copy + paste the same settings in init-start.

# Backup current settings
nvram dump > dump.txt

# Set country + TX-power
# ref: https://www.snbforums.com/threads/384-18_alpha-builds-testing-all-variants.63954/page-23#post-592739
nvram set 0:ccode=ALL
nvram set 0:regrev=0
nvram set 1:ccode=ALL
nvram set 1:regrev=0
nvram set wl0_country_code=US
nvram set wl0_country_rev=768
nvram set wl0_reg_mode=d
nvram set wl1_chlist="36 40 44 48 52 56 60 64 100 104 108 112 116 120 124 128 132 136 140 149 153 157 161 165"
nvram set wl1_country_code=US
nvram set wl1_country_rev=768
nvram set wl1_reg_mode=h
nvram set 0:maxp2ga0=114
nvram set 0:maxp2ga1=114
nvram set 1:maxp5gb0a0=110
nvram set 1:maxp5gb0a1=110
nvram set 1:maxp5gb0a2=110
nvram set 1:maxp5gb0a3=110
nvram set 1:maxp5gb1a0=110
nvram set 1:maxp5gb1a1=110
nvram set 1:maxp5gb1a2=110
nvram set 1:maxp5gb1a3=110
nvram set 1:maxp5gb2a0=110
nvram set 1:maxp5gb2a1=110
nvram set 1:maxp5gb2a2=110
nvram set 1:maxp5gb2a3=110
nvram set 1:maxp5gb3a0=110
nvram set 1:maxp5gb3a1=110
nvram set 1:maxp5gb3a2=110
nvram set 1:maxp5gb3a3=110
nvram set 1:maxp5gb4a0=110
nvram set 1:maxp5gb4a1=110
nvram set 1:maxp5gb4a2=110
nvram set 1:maxp5gb4a3=110
nvram set territory_code=US/01
nvram set wl0_txpower=500
nvram set wl1_txpower=500
nvram set wl_txpower=500
nvram commit

# If changing 5G in the interface doesn't work:
# https://www.snbforums.com/threads/changing-channel-width-from-terminal.12432/
nvram set "wl1_chanspec=149/80"
nvram commit
service restart_wireless

init-start

#!/bin/sh
# Follow steps @ https://github.com/RMerl/asuswrt-merlin.ng/wiki/User-scripts
// paste the same nvram settings here