I have a new SM-P610 device that I want to install Lineageos on. I am following the instructions at https://wiki.lineageos.org/devices/gta4xlwifi/install but I am unable to unlock the boot loader.
Under "developer options" on the phone I can toggle "OEM unlocking" and changing this is reflected on the download mode screen which shows either "OEM LOCK: ON(L)" or "OEM LOCK: ON(U)", so obviously Locked or Unlocked, however ON in both cases.
If I try to run the heimdall command to flash the recovery image it prints "ERROR: Failed to receive session end confirmation!" and on the screen "Custom Binary(RECOVERY) Blocked By OEM Lock" is displayed in red.
So how do I actually unlock the boot loader?