[jshzh]

Thanks. I kinda of solved the problem - partially - I can't remember what I did - probably change the setting in script so the device will alternate the booting between nickle and menu. Now the situation is I can go like these:

1 menu - nickle - (exit or stk) - menu
( stk does not lead to koreader directly but to the menu)

2 menu -(by nickle to koreader in additions directly) nickle - (by stk icon) menu

3 menu -koreader - menu

4 menu - (by koreader to nickle in additions directly) koreader - (by exit) nickle - menu

The Exit to upside-down screen problem disappeared. But "Swift to Koreader" always leads to menu not Koreader. The patch didn't create connection from nickle to koreader.
I think I can live with that - I can always start koreader after coming back from nickle to menu. For your reference though. I actually reinstalled the patch, maybe I should do it again.