Hello loseyourself! 
Hmmm, I’m not sure I fully understood your question. But if I got it right, your complaint has to do with the fact that locking the bootloader may brick the phone.
If that’s the cause, then we’ve confirmed it before: installing software with an older security patch than the one you had before will trigger Android Rollback Protection. This is a well-established security feature since Android 6 and we’ve made numerous warnings about it. It’s in our support articles.
In addition to that, it’s important to keep in mind that when installing software manually there are risks such as random data transfer interruptions (bad cable or power stops), buggy software, etc.
However, if you are talking about a reproducible bug we weren’t aware of, we’ll be happy to take a look. For that, please contact our amazing Customer Support team who will be keen on taking a look.
Have an amazing Fridayyyy