Do not continue after something fails!
Before you start, make sure you’ve deleted every Google account from the device on a fresh install. This will prevent “Factory Reset Protection” (FRP) from kicking in during the setup steps.
Installation is only possible on a device with unlocked bootloader!
We are not responsible for any damage you made to your device. You have been warned!
Flashing instructions
Prerequisites
- Your Samsung Galaxy A71
- USB-C cable that can do data transfer
- A computer with ADB installed running Windows 10 or later or Linux
Pre-installation:
- Download the latest ROM file (referred to as crdroid.zip).
- Download support files from the site:
- recovery.img
- vbmeta.img
- Download the latest GApps (referred to as gapps.zip).
- Ensure you are on latest available firmware for your device.
Unlocking bootloader
This WILL factory reset your phone. Back up any data before continuing.
- Open Settings, and go to About phone -> Software information
- Tap "Build number" 7 times
- Go back, then select "Developer options"
- Enable "OEM unlocking", and press "Enable" on the warning (if the OEM unlocking option doesn't exist, your phone is not unlockable, likely it was purchased from a carrier like Verizon that restricts unlocking so you cannot continue).
- Turn off the phone
- Hold down volume down and volume up, and while doing this, plug the phone into your computer.
- Once the Warning screen appears, let go of all buttons.
- Hold down volume up until it says "Unlock bootloader?", then press volume up again.
Installing TWRP
You will have to install Odin and the Samsung USB drivers on a computer, which requires Windows XP or later, or you can do it from heimdall (latest version or at least 2.0.2) under Linux.
- Turn the phone off
- Hold down volume down and volume up and plug the phone into your computer.
- When the Warning screen appears, let go of all buttons.
- Press volume up to enter download mode.
- Get recovery.img and vbmeta.img from the download section.
- For heimdall you must run: heimdall flash --VBMETA vbmeta.img --RECOVERY recovery.img
- For Odin you must pack both files on a plain tar file and then select that tar for AP. Go to "Options", and verify "Re-Partition" is unchecked. Having it checked may result in a brick. Then "Start"
- When the phone reboots, hold down volume up and power until it boots into recovery
Installing crDroid
- From crDroid recovery (you can enter it by pressing Vol Up + Power buttons with the device connected to your USB port.).
- Run "Factory reset" > "Format data/factory reset" > "Format Data" and "Format system partition".
- Tap on "Apply Update" > "Apply from ADB".
- On your PC, open terminal and type the following command to flash;
adb sideload crdroid.zip- Do the sideload steps for gapps and whatever extra thinks you want to install too.
- Enjoy the fun ...
On first boot, the phone may remain on the Samsung Galaxy A71 logo for several minutes, this is normal and only happens on first boot, however in some rare cases, the phone will hang. If the phone doesn't go past the Galaxy A71 logo after 15 minutes, hold down power+volume down to reboot the phone, afterwards it will boot.