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If your Galaxy A7 is a (non-Samsung chipset like MediaTek), it might have a real Fastboot mode. Try:
Open the Platform Tools folder, type cmd in the address bar, and press Enter to launch the Command Prompt.
Because Samsung utilizes its proprietary protocol instead of standard Android Fastboot, accessing a functioning Fastboot environment on a "repack" device requires specific steps depending on your exact setup. Method 1: Accessing Fastboot Mode via Android Recovery Menu how to open fastboot mode on samsung galaxy a7 repack
adb reboot download
Once inside, you can run standard Fastboot commands, such as: If your Galaxy A7 is a (non-Samsung chipset
Press and hold the Volume Down + Power buttons simultaneously for 7 to 10 seconds.
However, modified or "repack" firmwares (which frequently utilize custom structural partitions or custom recoveries like TWRP) allow you to bridge this gap to access a functional Fastboot protocol. Prerequisites Before You Begin Method 1: Accessing Fastboot Mode via Android Recovery
If you are stuck on a screen that says "Entering fastboot...", your device is not in Download Mode. Immediately force a restart by holding Power + Volume Down for about 10 seconds, then try the correct key combination for your model again.