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ESP32-WROOM-32 ESP-WROOM-32 ESP-32S ESP-DowdQ6 Dual Core 32Mbits SPI flash uart mode smd ESP32 module espressif original - buy at the price of $2.50 in aliexpress.com | imall.com
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Custom PCB with ESP32 WROVER: could not flash firmware in Arduino (boot mode problems) - ESP32 Forum
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