$ sudo esptool --port /dev/ttyUSB0 write_flash -fm dout 0x0000 230917_ahoy_0.7.56_3b4365a_esp8266.bin
esptool.py v2.8
Serial port /dev/ttyUSB0
Connecting....
Detecting chip type... ESP8266
Chip is ESP8266EX
Features: WiFi
Crystal is 26MHz
MAC: a8:48:fa:c1:77:4f
Enabling default SPI flash mode...
Configuring flash size...
Auto-detected Flash size: 4MB
Erasing flash...
Flash params set to 0x0340
Took 2.53s to erase flash block
Wrote 577536 bytes at 0x00000000 in 56.7 seconds (81.4 kbit/s)...

Leaving...
Hard resetting via RTS pin...