Can not update ROM on oneplus5t

Once I downgraded my oneplus 5t rom and now I can not upgrade the rom. It always stop with an error.

Please help me.

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What is the error must know to help better if the boot loader is unlocked and you have a custom recovery you should be able to upgrade with a twrp flashable oos with no trouble

So when upgrading always do a factory rest to ensure a clean install ,unless your on oos already