Assuming this is about OEM unlocking?

Developer options should appear after tapping Build Number 7 times in Settings -> About phone

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It's after installing so I can lock it back

Then do the above, the option should appear there!

Keep tapping build number, go to settings, tjen system, developer options

Phew! Ok... I had to repeat that tapping again for developer options to appear. Gotya. Just locked OEM and turned of dev options. Yay. This here alone is #zapathon worthy.

Awesome 🤙💜