Application for updating firmware of Stm32 CPU via Bluetooth by using Bluetooth-to-Serial modules. It support modules with classic bluetooth SPP protocol (i.e. HC-06) and also BLE modules on microcontroller cc254x (i.e. HM-10) Realization of the application is based on next documents from company STMicroelectronics. 1. AN2606 STM32 microcontroller system memory boot mode 2. AN3155 USART protocol used in the STM32 bootloader How to use application. PREPARATION 1. Set correct serial configura