1. Read Flash Size: esptool.exe –port COM3 –baud 921600 flash_id
2. Read Bin File From Flash Memory: esptool.exe –port COM3 –baud 921600 read_flash 0 0x400000 esp32blink.bin
3. Write Bin File on Flash Memory: esptool.exe –chip esp32 –port COM3 –baud 921600 –before default_reset –after hard_reset write_flash -z –flash_mode dio –flash_freq 80m –flash_size 4MB 0x0 D:\esp32blink.bin