I've modified your program a little to give us more information with the LED flash.
Can you try this and let me know what the LED does?
Please ensure you use the STARM_CAL_RTC.c from the "STM32F QUESTIONS" thread...
https://www.flowcode.co.uk/forums/viewt ... 918#p18918
Into directory ...
C:\ProgramData\MatrixTSL\FlowcodeV10\CAL\STARM
BLACKPILL STM32F411 RTC
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LeighM
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