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Compiler/MSP430FR2311: The upgrade problem of MSP430FR2311

Part Number: MSP430FR2311

Tool/software: TI C/C++ Compiler

dear sir

      l use ti MSP430FR2311 in my robot application    I press the button and the program enters BSL. If I upgrade the program immediately, it will be successful.But if after entering BSL for a while, about ten seconds,

it  can't soft upgrade  again, what`s the reason of the problem ,how can l solve this problem ?

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