Hi there,
please try below things.
- change to another usb cable
- please change to another pc
- if both of them does not work, please download below package and refer to instructions. thanks.
<LINK_TEXT text=“https://github.com/SeeedDocument/forum_ … o_boot.zip”>https://github.com/SeeedDocument/forum_doc/raw/master/reg/seeeduino_boot.zip</LINK_TEXT>
best rgds
Bill