My router is a RT-AX59U, running firmware version 3.0.0.4.388_33407 (newer versions are bugged with unreliable Wi-Fi).
xx@xxx:/tmp/home/root# cat /proc/mounts
/dev/root / squashfs ro,relatime 0 0
devtmpfs /dev devtmpfs rw,relatime,size=246024k,nr_inodes=61506,mode=755 0 0
proc /proc proc...