Galaxy A70 unlock your bootloader twrp root

November 13, 2019

enabling developer settings first, enable oem unlocking
shut down your phone
hold volume up and down at the same time and while holding them plugin your charger.
Your phone now should show a green screen with instructions to unlock the bootloader.
Just follow them and after the unlocking your data should get wiped. After that your device will boot up and land in setup screen.
Do not setup anything, just skip as much as possible, because your phone will get wiped again.
Enable developer settings and make sure oem unlocking is greyed out and enabled. (If it does not show up, connect to a network first!)

Download twrp https://github.com/Grarak/android_device_samsung_a70q-twrp/releases
Push the recovery.img file you just download for TWRP to your phone
Open Magisk Manager and hit install and patch a file.
Select recovery.img and Magisk should start the patching process.
Once Magisk is done, boot into TWRP.
Backup your boot partition first and afterwards go into install and then hit install image on the bottom right of the screen.
Select /sdcard/Download/magisk_patched.img and install it to boot.
Now reboot and Magisk should work.
If you run into issues after this, go into TWRP and restore the boot partition you backed up previously.