Regarding Bootloader updating in v4.2.2[%7131633556] i have Ender 3 v2 printers and one of my v4.2.2 boart stm32 ic was short circuited while cleaning hotend heater 24v and temperature sensor , so after check i replace the stm32f103RCT6 ic with NEW STM32F103RCT6 IC but as the ic has no bootloader install in it it is not taking any firmware update from sdcard , So can any one help me on how to install bootloader in it