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About MSC-MOD 20, it is a question.


The firmware version is v2.0.0.
This is the case where N commands are executed across multiple directories.
Although the @ command succeeds and the file exists, the N command becomes !04.
If the file found by the N command is deleted with the D command, the ACK of the D command includes the execution result of the next N command.


Sounds like there is a problem in your code as you are getting out of sync.


There is a problem in your code.
I actually tried the @, N, D command, but it does not matter at all.
Have you tried with a PC connected via UART?
First, please connect with PC via UART and execute each command.

e.g. There is a file named TEST.TXT on the microSD card.


Thank you.