Maple mini bricked

[warner]

I received today a Maple Mini board and wanted to do some tests with it by programming it with the Arduino IDE.
So I searched Internet and found out that I had to flash another bootloader. So I installed Flash Loader Demonstrator and uploaded the bin file with a FT232. Then disconnected the FT232 and plugged the USB into the board. Nothing. I'm running W10, no pling that a new USB device was recognised.
The led on the board is off, and with boot1 low and pressing the reset sw while pressing the but=32 (connected to boot0) switch nothing happens, the FLD does not recognise the device (connected to the FT232). This did work at first.
Is there anyting I can do to unbrick the device? Or is it ready for the garbage bin?
The chip is labeled STM32F103C8T6GH28Z and at first the FLD said it was a 64K device, not the 128K a 'real' maple mini should be.

[Edogaldo]

Hi @warner, if you just tried to install "a bootloader" from the web (which?! from where?!), you should not have bricked the chip: it's quite robust and cannot be bricked so easily!
You can install another sw bootloader by leveraging the standard ST system USART bootloader (on USART1), which can be started by setting boot0=1 and boot1=0 and then restarting the device (ref AN2606).
I'd say that the correct bootloader for the Maple mini is this one: https://github.com/rogerclarkmelbourne/ ... boot20.bin
Respect to the 64kb vs 128kb, 64kb is correct as long as the chip is a STM32F103C8, this chip effectively has 64kb (at least officially - unofficially it appears that it has 128kb as well, even if not declared).
Consider that originally the maple mini mounted a STM32F103CB chip, which is the 128kb version but now many chinese producers decided for a downgrade to the probably cheaper version (the only difference is the flash size)...

Hope this helps..

[warner]

I think I flashed generic_boot20_pc13.bin from https://raw.githubusercontent.com/roger ... 0_pc13.bin

[warner]

I did succesfully flash the maple_mini_boot20.bin file. So I can try (tomorrow) uploading some code.
Thanks. I connected boot0 to Vcc and boot1 to GND and after power-up pressed the reset and then I had connection.

[mrburnette]

For Roger's core, the WiKi is helpful:
https://github.com/rogerclarkmelbourne/ ... STM32/wiki

as well as:

https://stm32duinoforum.com/forum/wiki_ ... _Mini.html