serial-dump.py

import serial
import sys

bytes_received = 0
with open("dump.bin", "wb") as f:   
    with serial.Serial('/dev/ttyUSB0', 500000, timeout=4) as ser:
        ser.write(b'\nsf probe\n')
        print(ser.read(4000).decode())
        ser.write(b'sf dump\n')

        while True:
            chunk = ser.read(512)
            if not chunk:
                break
            f.write(chunk)
            bytes_received += len(chunk)
            percent_done = bytes_received / (64 * 1024 * 1024) * 100
            sys.stdout.write(f"Received: {bytes_received} bytes {percent_done:.0f}%\r")
            sys.stdout.flush()

sys.stdout.write("\n")