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+njw@lx-02014922 ~/private/devel/esptool/bin $ ./python3 ./esptool.py --port /dev/ttyACM0 chip_id
+esptool.py v4.8.1
+Serial port /dev/ttyACM0
+Connecting....
+Detecting chip type... Unsupported detection protocol, switching and trying again...
+Connecting.....
+Detecting chip type... ESP32
+Chip is ESP32-PICO-D4 (revision v1.1)
+Features: WiFi, BT, Dual Core, 240MHz, Embedded Flash, VRef calibration in efuse, Coding Scheme None
+Crystal is 40MHz
+MAC: 90:15:06:f5:53:cc
+Uploading stub...
+Running stub...
+Stub running...
+Warning: ESP32 has no Chip ID. Reading MAC instead.
+MAC: 90:15:06:f5:53:cc
+Hard resetting via RTS pin...
+
+