USB is not connected (with COM port)
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              2022-12-20
            
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- Henry 2022-12-21- Cause analysis: ① Whether the "Device Port" in the lower right corner of the software is correctly selected (USB and network). ② The first time you installed the software, you did not install the USB drive, and then you installed the operating software. ③ If the port does not correspond, change the port again (for example, COM5 changes to COM3). ④ If the control motherboard hardware does not have U43 (LJ245A), it cannot be upgraded to a special version. 0Rispondi-  : ⑤ If there is U43 (LJ245A) upgrade for the control motherboard hardware, it cannot be upgraded before 5.0.21. Solution: Reburn the program if the version is wrong. 
 
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