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10. (conditional) If your board doesn't have a button to enter UART mode – you would need to revert
the jumpers back to default "FLASH" mode. Else the firmware will not execute upon powering
the board (it would boot in UART bootloader mode).
11. Voila. The firmware and the AT command set are now updated. We can head to the next chapter
where we would test the firmware.
Page 13 of 17
Upgrading ESP8266
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