It cannot be found in R+ Manager 2.0 and cannot be fixed by firmware.
Can I do something or have no choice but to go back to repair?
Please specify the USB interface you used for connecting DYNAMIXEL (USB2Dynamixel or U2D2?)
I use U2D2 and U2D2 PHB Set to connect and control this PRO.
Is there any solution?
Please with DYNAMIXEL Wizard 2.0 to see if it works with your setting.
Also make sure that DYNAMIXEL is properly powered with 24V(LED blink at power up) as well as connection between U2D2 / U2D2 PHB and PC.
If it doesn't detect H54 or firmware recovery fails, please request repair service.