According to @ASUSWRT_2020 "In the next release, we will change the AX models to the same SDK and add RT-AX86U, RT-AX58U, RT-AX56U, TUF-AX3000, RT-AX56". This implies that at the next release candidate all the newer AX class routers will be able to get the latest 386 builds. @RMerlin how does this align with your info?