Question Stock T-Mobile firmware

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Does anyone have the stock OP9 firmware they can give me? I rooted on C17 and can't take updates. I tried everything I could think of but haven't been able to unroot the device and take the update to C18. I'm hoping if I flash the stock firmware I will be back on track. I only did root to use substratum but theming is extremely limited so I want to go back to stock

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    I just got my hands on a OP9 from T-Mobile and I'm having issues getting updated past and I havent been able to get up to A12 yet. I'd stay where you are unless you don't mind A11, then I'd just use the recovery MSM for