L&LD
Part of the Furniture
Little bit off topic but I've noticed the official firmwares for RT-AC68U and RT-AC1900P are binary identical:
RT-AC1900P_3.0.0.4_380_3831-g93dfe8c.trx = RT-AC68U_3.0.0.4_380_3831-g93dfe8c.trx
That is also why RMerlin's firmware for the RT-AC1900P is usable too.