STM32F105/107xx revision Z errata sheet 2.16 Bootloader unavailability on STM32F105xx and STM32F107xx devices with a date code below 937 Description During the boot loader activation phase, if the USART1_RX (PA10), USART2_RX (PD6, remapped pin), CAN2_Rx (PB5, remapped pin), OTG_FS_DM (PA11) and/or OTG_FS_DP (PA12) pin(s) are connected to low level or left floating, the boot loader cannot be used. It is not possible to connect to the bootloader through either of CAN2 (remapped), DFU (OTG FS in Device mode), USART1 or USART2 (remapped). In 64-pin packages, the USART2_RX remapped pin PD6 is not available and is internally grounded. Therefore, the bootloader cannot be used at all. Workaround
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