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I am following the very first step with STM32L562E-DK, to run a .bat file ..But I received error: Initializing the option bytes failedSame in CLI too..How can I recover my board? any hardware reset? 
We are using STM32L5 Nucleo board and TZEN is enabled and DBANK mode is enabled too..!How to switch dual bank mode to single bank mode in option bytes(if any h/w or s/w changes)??Please explain the procedure to understand what are the changes needed ...