In SX Microcontrollers, SX/B Compiler and SX-Key Tool, william wrote:

I have the same problem with "SX-Key not found on COM1" when using v3.1 IDE on my SXKey Rev E.
I off power, on back again same problem.  I pull out the SX Key Rev E. plug in again, same problem.
I have to repeat the above about 20 times before I get lucky.

I change to SXKey Rev F. and it just works, almost everytime.
Same board, same chip, same power supply, same serial cable, same PC, same software.

However, certain boards with certain SX chip works ok.

Everytime I complain about this on the forum, they tell me the same old story 
1.  Check power supply, make sure it's solid
2.  They don't see a problem with SXKey Rev E.....

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