we have a board with the STM32F107RC controller in TQFP64 package. According to the AN2606 chapter 13.3.2 the internal bootloader is not available on our package with a date code below 937. However the date code is only 1 digit so does this means from 2009 or 2019 on? We ordered some sample with date code 708 and 635.
The controllers have the latest bootloader version, we checked by the debugger but still we can not access the USART1 bootloader. All other pins have the correct level on reset so we are more or less clueless.
Does anyone knows more about this issue in combination with the date code?