I just read something interesting in the xda instructions :
- Flash custom VBMeta image ( https://dl.twrp.me/gts4lvwifi/vbmeta.tar.html ) in Odin ( use AP slot )
- After flashing VBMeta, boot to stock. It’ll likely ask you to wipe data
- Connect to WiFi network and make sure OEM Unlock in developer options is still checked
- Now you can flash TWRP ( https://dl.twrp.me/gts4lvwifi ) in Odin ( use AP slot once again ), for convenience you can hold volume up while flashing it so that you boot to recovery right after it’s flashed
If factory reset (wipe /data) is not proposed, force it : go to settings