Hi
nidamk660Thank you for your asking. Kindly provide the information below so that we can better assist you.
1. Did you download Unlock boot loader Version 9.2.0.0?
https://rog.asus.com/phones/rog-phone-model/helpdesk_download2. Please ensure Internet Stability while performing the unlock steps.
3. Did you purchase the device from ASUS authorized channel? If not, please check with your vendor whether the device had been unlocked or flashed before. If so, please check your inbox and PM me your purchased channel and SN for further checking.
Besides, please note that unlocking the device or flashing the custom ROM are quite risky, may causing security issues like Widevine Issue, banking app usage issue, or unexpected software issues. Furthermore, any unlocked/rooted/custom rom device will be regarded as out of warranty device, revised device. Last, officially, we do not provide lock back service/tools. Once the device is unlocked, the server will have related record and it can never be revised even if you lock the device back by yourself.