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BOOT + RESET

dmesg

[3539370.249607] usb 1-1.2: new full-speed USB device number 45 using dwc_otg
[3539370.395610] usb 1-1.2: New USB device found, idVendor=28e9, idProduct=0189, bcdDevice= 1.00
[3539370.395626] usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[3539370.395638] usb 1-1.2: SerialNumber: 䌳䩂

Found DFU: [28e9:0189] ver=0100, devnum=45, cfg=1, intf=0, path="1-1.2", alt=0, name="@Internal Flash  /0x08000000/128*001Kg", serial="??"


dfu-util

git clone https://git.code.sf.net/p/dfu-util/dfu-util dfu-util

Found DFU: [28e9:0189] ver=0100, devnum=45, cfg=1, intf=0, path="1-1.2", alt=0, name="@Internal Flash  /0x08000000/128*001Kg", serial="3CBJ"