Last week I was happy to find a near-mint condition 2020 Galaxy Tab S5E on the used market (GSM Arena specs here and /e/OS doc there ). But despite having the “OEM Unlocked” option activated in Android 11, the device isn’t showing any unlocking options in the “blue boot screen”… but on the next one …

So, the end of the story is that rather having to wait 7/14 days or trying obscure SoC flashing, the pawn shop was ok to exchange my T720 for the exact same model. My hypothesis is that with the first tablet, the in-house Samsung Android updating system has locked the bootloader during the upgrade …