@vitaj You might try raising an 'Issue' here:
https://github.com/Xinyuan-LilyGO/LilyGo-EPD47/issues
And then attract their attention with an email here:
sales@lilygo.cc
E-Paper displays show their last image until refreshed.
Did you try a simple example from here?:
https://github.com/Xinyuan-LilyGO/LilyGo-EPD47/blob/master/examples/screen_repair/screen_repair.ino