here is a list of all images in the img directory:

>>> os.listdir('img')
['UiFlow_USB_320_240.img', 
'UiFlow_bg_320_240.img', 
'applist_bar_320_40.png', 
'cloud_green.png', 
'cloud_red.png',
'loding.png',
'loding_fail.png',
'loding_success.png', 
'm5stack.pbm', 
'm5stack.png', 
'menu_bg.png', 
'setup_bar_320_40.png', 
'start_logo_320_240_dot.png', 
'start_logo_320_240_flow.png', 
'start_logo_320_240_ui.png',
'startup_bg_320_240.img', 
'uiflow_logo16bitTB.bmp', 
'usb.png',
'wifi_config_ap_connect.png', 
'wifi_config_bg_320_240.img', 
'wifi_config_sta_connect.png',
'wifi_config_sta_fail.png', 
'wifi_connect_ui_bg_320_240.img',
'wifi_green.png',
'wifi_red.png']

You can set it like this:

image0.set_img_src("img/wifi_red.png")

Thanks
Felix