again: u cant not root the A21s ... many videos and website show, how u root ths smartphone, but it DOESNT work.
i think, they want only visitor and follower or they use or try it with an older or modded firmware and not the newest one !
Toggle the OEM when unlock, reboot to the bootloader than a 2 option should appear like "Volume up long press : Device unlock mode". Just follow the instructions and unlock.
You probably did not do that.
---------- Post added at 11:38 AM ---------- Previous post was at 11:14 AM ----------
The stock rom with the Magisk it's better than use a ROMs not fully compatible with this phone. So if you have another method/file, than share with us! It will be great if it's easy than my tutorial.
---------- Post added at 12:01 PM ---------- Previous post was at 11:38 AM ----------
Sometime the system blocks you from flashing files even with the OEM unlocked. So look at "KG STATE" on the top of your bootloader, it should be "Checking" if so it's unlocked and you can flash your files, but if it's "prenormal" than the system blocked the bootloader. You need to flash your stock rom, reboot to the bootloader, Lock the OEM, reboot to your system and toggle disable/re-enable the OEM Unlock than reboot to the bootloader and unlock the OEM.