diff --git a/RaspberryPi&JetsonNano/python/lib/waveshare_epd/epd2in7.py b/RaspberryPi&JetsonNano/python/lib/waveshare_epd/epd2in7.py
index 0c6b28c..7dc1f99 100644
--- a/RaspberryPi&JetsonNano/python/lib/waveshare_epd/epd2in7.py
+++ b/RaspberryPi&JetsonNano/python/lib/waveshare_epd/epd2in7.py
@@ -272,7 +272,7 @@ class EPD:
         epdconfig.spi_writebyte([command])
         if data:
             epdconfig.digital_write(self.dc_pin, epdconfig.GPIO.HIGH)  # HIGH: write data
-            epdconfig.spi_writebyte(data)
+            [epdconfig.spi_writebyte(byte) for byte in data]
 
     def set_lut(self):
         look_up_tables = {