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Download a custom recovery
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Power off the device, and boot it into download mode:
- With the device powered off, hold Volume Down + Bixby + Power.
- Now, click the button that the on screen instructions correlate to “Continue”, and insert the USB cable into the device.
- On your machine, open a Command Prompt or PowerShell (Windows) window, or Terminal (Linux or macOS) window, and type:
heimdall flash --RECOVERY <recovery_filename>.img --no-reboot
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A blue transfer bar will appear on the device showing the recovery image being flashed.
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Unplug the USB cable from your device.
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Manually reboot into recovery, press the Volume Down + Power buttons for 8~10 seconds until the screen turns black & release the buttons immediately when it does, then boot to recovery:
- With the device powered off, hold Volume Up + Bixby + Power. When the blue text appears, release the buttons.