unrooting – How can unlock the bootloader on the Honor 8C without unlock code?

The article describes how to unlock bootloader on honor-8c.

https://www.techdroidtips.com/honor-8c-unlock-bootloader/

The last step is

And now to apply for your Honor 8C unlock code, fill in the necessary details ie, Product Model, Product Serial Number, Product IMEI or MEID, Product ID, and Verification code.

I have apply for my unlock code,the huawei official technician says that it can’t provider unlock code for long time.Is there another way to unlock the bootloader or root my Honor-8C then?