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Yes DTU mode should work if SD card didn't

You may need to add jumpers per board you are using, to put in flash mode.

I spent all day trying to force DFU mode with no luck. I think maybe I borked it by loading STM firmware onto a GDM chip when I first flashed from my pi3b. Need to keep digging.

I ordered an st-link to try to recover and a new mobo in case that doesn't work. Going to solder a header onto the SWD pins while I wait on shipping.

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Discussion

SUPERMAX 11mo ago

Damn, best of luck to you

Bill Cypher 11mo ago

I considered alternate motherboards but I can't see why. What value would I get if I'm already running a 32bit microprocessor in the stock board?

SUPERMAX 11mo ago

Nothing it should be fine

Is this just a creality board?

Bill Cypher 11mo ago

Yep, stock creality board.

I think the issue is I followed bum directions and flashed stm32 firmware onto a gd32 chip.

Don't trust, verify... not just for bitcoin.

SUPERMAX 11mo ago

Probably the issue

Don't keep messing that board up and you'll burn her possibly!