Stuck at control board flashing

I was not able to flash my Octopus Pro 446 automatically, so I used an external SD card to flash the firmware. After a power cycle, the firmware.bin turned into firmware.cur, indicating that the Octopus Pro 446 was flashed successfully. However, RatOS still says Octopus Pro 446 was not detected. Clicking on "check board status" does nothing, and I cannot click next.