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Deep testing APK removed?

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Sep 14, 2015
Hey guys.

I relocked my bootloader a while back, but since lineage os is unofficially available for the find x2 pro i was thinking of trying it. But I can't seem to unlock my bootloader. I just get a HAL error so i thought maybe my unlock permission has been reset. So I tried redownloading the APK but it won't install, saying the signature already exists, even though I don't have the app installed.

Can anyone assist me with unlocking my bootloader, again?