I have two different STM32L451 boards.
One version runs at 3.3V and the other at 1.95V.
On the 3.3V board, I can enter the SPI Bootloader and erase/program Flash reliably.
But on the 1.95V board, the flash write fails. In the same 2K page and on usually the same 256-byte block, I fail to get an ACK after sending the write command.
I have the same issue on two L431 boards as well.
