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On your device, go to Settings > About Phone > Build Number and tap it seven times. Then, go back to Settings > Developer Options and enable OEM Unlocking.

Beyond the official site, other trustworthy sources include: twrp 3520 download top

If you are a gamer and typed "3520" looking for the game Stellaris (where 3.5.2 was a specific update codenamed "Dick"), the feature introduced in that patch was: On your device, go to Settings > About