waveshare 7.13inches won't draw

[Ledjob]

I have the 7.13 hat B and tried to run the example : epd_2in13bc_test.py but there is nothing on the screen. Here are the logs :

INFO:root:epd2in13bc Demo INFO:root:init and Clear DEBUG:waveshare_epd.epd2in13bc:e-Paper busy DEBUG:waveshare_epd.epd2in13bc:e-Paper busy release DEBUG:waveshare_epd.epd2in13bc:e-Paper busy DEBUG:waveshare_epd.epd2in13bc:e-Paper busy release INFO:root:Drawing INFO:root:1.Drawing on the Horizontal image... DEBUG:waveshare_epd.epd2in13bc:Horizontal DEBUG:waveshare_epd.epd2in13bc:Horizontal DEBUG:waveshare_epd.epd2in13bc:e-Paper busy DEBUG:waveshare_epd.epd2in13bc:e-Paper busy release INFO:root:2.Drawing on the Vertical image... DEBUG:waveshare_epd.epd2in13bc:Vertical DEBUG:waveshare_epd.epd2in13bc:Vertical DEBUG:waveshare_epd.epd2in13bc:e-Paper busy DEBUG:waveshare_epd.epd2in13bc:e-Paper busy release INFO:root:3.read bmp file DEBUG:waveshare_epd.epd2in13bc:Horizontal DEBUG:waveshare_epd.epd2in13bc:Horizontal DEBUG:waveshare_epd.epd2in13bc:e-Paper busy DEBUG:waveshare_epd.epd2in13bc:e-Paper busy release INFO:root:4.read bmp file on window DEBUG:waveshare_epd.epd2in13bc:Horizontal DEBUG:waveshare_epd.epd2in13bc:Horizontal DEBUG:waveshare_epd.epd2in13bc:e-Paper busy DEBUG:waveshare_epd.epd2in13bc:e-Paper busy release INFO:root:Clear... DEBUG:waveshare_epd.epd2in13bc:e-Paper busy DEBUG:waveshare_epd.epd2in13bc:e-Paper busy release DEBUG:waveshare_epd.epd2in13bc:e-Paper busy DEBUG:waveshare_epd.epd2in13bc:e-Paper busy release INFO:root:Goto Sleep... DEBUG:waveshare_epd.epd2in13bc:e-Paper busy DEBUG:waveshare_epd.epd2in13bc:e-Paper busy release DEBUG:waveshare_epd.epdconfig:spi end DEBUG:waveshare_epd.epdconfig:close 5V, Module enters 0 power consumption ...

[SSYYL]

Please check whether there is a version label on the back of the HAT. If V3 is posted, then you should run epd_2in13b_V3_test.py. if V4 is posted, then you should run epd_2in13b_V4_test.py.