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I am new to Java Card. I want to know how to store some offline data (such as a balance). Does it need to use a file structure(compliance to 7816 standard) to store data?
I am a STM32F103RBT6+SIM800C project, and I need to add the function of network firmware update.
My question is: STM32 IAP method, how to write SRAM program?
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