Samsung Galaxy A70

je vois plus traditionnelle…

[HOWTO] an Unified Install Guide Project for /e/

You need to unlock your bootloader by enabling OEM unlocking on developer settings, then power off the phone.
Then we must enter download mode by holding volume up and down and then plug in a usb cable connected to your computer. You should see a green screen with instructions to unlock the bootloader, by following them your data will get wiped and the device will boot to setup, set it up so that it has network connection, no need to add acounts or anything. Check that OEM unlocking is now enabled and gray.

Now we must enter download mode again and flash both vbmeta.img and recovery.img, you can do so by adding them to a tar archive and writing it to AP using Odin on Windows or by using heimdall 2.0.2 or later like this: heimdall flash --VBMETA vbmeta.img --RECOVERY recovery.img
One warning here, you must boot into recovery right after doing this, so right when the screen turns black as it is going to reboot, press and hold power and volume up without unplugging the cable.

heimdall flash --VBMETA vbmeta.img --RECOVERY recovery.img