openmv h7 plus固件更新到4.1.2后程序报错，尝试dfu刷写固件退回4.1.1时duf提示刷写成功后接IDE，板子绿灯快闪五下，不识别，只能用IDE更新固件到最新，请问如何退回4.1.1

更新固件4.1.2后，运行之前Edge Impulse上训练的模型，一点IDE左下角运行几秒后OPENMV H7就与电脑失去连接（运行上面的连接按钮变灰色），此程序在之前的固件上运行是好的，麻烦尽快帮忙找到解决办法，谢谢

# Welcome to the OpenMV IDE! Click on the green run arrow button below to run the script!

import sensor, image, time, utime
from machine import I2C
from pyb import RTC
from vl53l1x import VL53L1X
from pyb import UART


i2c = I2C(2)
distance = VL53L1X(i2c)

rtc = RTC()
rtc.datetime((2021,11,25, 4,20,11, 0, 0))



uart = UART(3)

uart.init(115200, timeout_char=1000)

sensor.reset() # Reset and initialize the sensor.

sensor.set_pixformat(sensor.RGB565) # Set pixel format to RGB565 (or GRAYSCALE)

sensor.set_framesize(sensor.QVGA) # Set frame size to QVGA (320x240)

sensor.skip_frames(time = 2000) # Wait for settings take effect.

clock = time.clock() # Create a clock object to track the FPS.




while(True):

    clock.tick() # Update the FPS clock.
    img = sensor.snapshot() # Take a picture and return the image.
    uart.write(img.compressed(quality=50)) # Note: OpenMV Cam runs about half as fast when connected
#    uart.write("range: mm ", distance.read())
#    uart.write(rtc.datetime())
    print("range: mm ", distance.read())
    time.sleep_ms(1000)