unlock bootloader in custom rom - Android Q&A, Help & Troubleshooting

hello everyone...
is there any way to unlock boot-loader in custom ROM?
Unfortunately i have locked my boot-loader in custom ROM( resurrection remix )
And in this ROM there is no option like OEM unlock option so that i could re-unlock boot-loader...
please help to re-unlock boot-loader in custom rom

Have you tried using ADB or FastBoot with the oem unlock option? I read OnePlus phones can auto lock the bootloader sometimes on reboot and that's how I unlocked my OnePlus 6 bootloader in the first place to install TWRP

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I have version 0323 of this rom http://forum.xda-developers.com/one.../rom-cyanogenmod-13-x-oneplus-x-onyx-t3279784 installed and I dont have custom recovery flashed I just boot into TWRP whenever I need to. Today I decided to flash 4K camera mod, but when I tried to boot into TWRP and abd said this (see picture). I've used a lot of different roms before this one and i've never had any problems with this.
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Also, if I relock my bootloader again using fastboot oem lock, will I be able to unlock it using fastboot oem unlock or will I have to use MI tool?
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