Hi, I read your brief. I have questions now. 1) Which device model do you intend to? 2) "Show my custom image when phone is turning on" - There're several steps for displaying LOGO. i.e., boot-loader, kernel, android animation. Do you want replace all? 3) "Phone can't be turned on if it doesn't have more than 40‰ of battery" - Turn on 40% , it is not simple. Need to customize kernel level. How about implement this feature on Android level? Looking forward your reply. Sincerely.