https://www.espressif.com/sites/default/files/documentation/esp8684_hardware_design_guidelines_en.pdf
- Set the module to UART Download mode by pulling IO9 (pulled up by default) low and IO8 high.
| pin | set |
|---|---|
| IO9 | low |
| IO8 | high |
| pin | set |
|---|---|
| IO9 | low |
| IO8 | high |
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