@targa I don't know if you still need this. Anyway, I would post a simple solution here as someone may need it.
Since you have flashed your device with Padavan, I guess you should have flash the breed bootloader.
It's really simple to flash openwrt onto your devices with breed.
- Restart to breed. (Unplug the power line then plug with reset pressed)
- Download kernel1 and rootfs0 from OpenWrt Firmware Selector.
- Select upgrade firmware.(更新固件 for Chinese user)
- Select "OpenWRT" mode.
- Upload the kernel1 and rootfs0 files.
- Done