Once you successfully open the mode (commonly mistaken as Fastboot Mode) on your Galaxy A7, the screen will show:
Older versions often use a physical home button and do not require a PC connection. Download Mode (Samsung's Fastboot) Power off the device. Press and hold Volume Down + Home + Power buttons together. When a warning screen appears, press to confirm and enter Download Mode. Alternative Method: Hardware Key Combo (No PC) How to Open Fastboot Mode on SAMSUNG Galaxy A7 ...
This is the fastest way but requires root privileges which yourself may not have. Once you successfully open the mode (commonly mistaken
Modern Samsung devices often require a connection to a computer to trigger this mode. your device completely. How to Open Fastboot Mode on SAMSUNG Galaxy A7 ...