In this article, we explore potential causes and effective solutions for the issue of STM32L071RBT6 microcontroller not waking from low-power mode. The STM32L071RBT6 is widely used for energy-efficient embedded systems, but users often face challenges in configuring its low-power modes properly. This guide will walk you through troubleshooting steps, common pitfalls, and best practices for resolving the issue to ensure your device returns from sleep mode as expected.