sudo rkdeveloptool ld
sleep 1
sudo rkdeveloptool db rk3399_loader_v1.27.126.bin
sleep 1
sudo rkdeveloptool ld
sleep 2
sudo rkdeveloptool ef
sudo rkdeveloptool ef
sudo rkdeveloptool ef
sudo rkdeveloptool ef
sudo rkdeveloptool ef
sudo rkdeveloptool wl 0 .img/quantum-flow-os-0.7.0-headless-rock-pi-4b-plus.img
sleep 3
sudo rkdeveloptool rd