BTW, I’m using RTC alarm to wake up from STOP2, but I would need to change the interval to 30s while the program is running. The problem is that the change will not be overwritten.

I tried as you suggested and as expected it does bring the current down to 2.6uA. Thank you for your support.

Hi @Sarra.S Peripherals used are: USART1, USART2, USART3, I2C3, QUADSPI