If your device is a "repack" (specifically a third-party replica or non-official assembly), the hardware keys might trigger a different bootloader menu:
To open Fastboot mode (often referred to as Bootloader Mode on Samsung devices) on a Samsung Galaxy A7, you typically need to navigate through the Android Recovery Menu
To summarize:
If your device is a "repack" (specifically a third-party replica or non-official assembly), the hardware keys might trigger a different bootloader menu:
To open Fastboot mode (often referred to as Bootloader Mode on Samsung devices) on a Samsung Galaxy A7, you typically need to navigate through the Android Recovery Menu
To summarize: