Be aware that there are Chinese clones of the STM32 that may have subtle
bugs in their implementations. It might just be trashed.
-John
Op za 28 jan. 2023 om 20:44 schreef Ray WW0AW via groups.io <hrpch=
[email protected]>:
Good morning to all you good folks on this forum;
I bought it on Aliexpress and it's dubbed
"S-A-A V2 Pro 4 inch GS-400"
Worked fine for a number of years.
Foolishly attempted to update FW to try to get 401 points...
Bang crash !!! - White screen of death - "USB not recognized" (Device
Manager)
Broke out my trusty STLINK V2 dongle, identified SWDIO, SWCLK etc on the
device and tried to reflash a new bootloader
(using STM32 Cube Programmer , which does successfully identify the MCU -
so it;s not "dead".)
All attempts have failed - tried every bootloader under the sun - "USB not
recognized" every single time
STM32 Cube programmer can successfully flash the .bin files into the MCU
but somehow the MCU doesn't respond appropiately.
Tried to blink PA6, PA7 LEDs ( there are some empty pads on the PCB)
without success (Several Blue pill's PC13 on the other hand respond
perfectly)
It's not the USB cable - tried several ones known to work fine on other
devices.
I'm stumped. Any help ?
