Thanks for the answer
more in the link that I put spoke asus RT-N56U
this product supports third-party firmware (ASUS RT-N56U >>> PDN firmware)
this router comes with U-BOOT
you can always upgrade the firmware you want, but different third-party firmware needs to modify the GPIO, please know...
Qual é o firmware padavan para este modelo?
https://pt.aliexpress.com/item/High-Performance-MT7621A-11AC-Dual-Band-2-4G-5GHz-OpenWrt-Gigabit-Dual-core-Wireless-WiFi-Router/32817736604.html?spm= a2g0s.9042311.0.0.2520b90aqJwYck