I've written an External Flash Loader and successfully tested erase, read, and write functionality first in my own firmware, then with ST-Link Utility v4.5.0, and also with STMCubeProgrammer v2.6.0.However, when I try to use it to debug with TrueStud...

Rev 6 of the errata document, section 2.2.13, states the following:The bootloader might not work on STM32L4RxxG/SxxG 1-Mbyte part number devices with date code week 04 2020 or earlier. This depends on the device bootloader version (V9.2 is not functi...

Rev 4 of "STM32L4Rxxx and STM32L4Sxxx device errata" states that"Data FIFO gets corrupted if the write sequence to the transmit FIFO is interleaved with other OTGFS register access"and to work around it,"Ensure that the transmit FIFO write accesses c...