I am sorry to hear your device seems to have a locked bootloader.
This is a useful question for anyone who puts in an Request a Device.
Subscribers who read the opening post to the category About the Request a Device category see
Please note requests should be made in the following form:
TITLE Brand Model - Device codename (if known)
ex: Xiaomi Redmi 5 plus - vince
A guide: [HOWTO] Find device codename
Device trees can be found in multiple locations, they are an extract of all the device specific and proprietary code needed by any custom ROM builder to liberate the device.
An example location is the repositories of LineageOS found here
If you submit a valid device codename for a device supported (or supported in the past) by LineageOS into the Search bar the device tree is revealed.
Our example: Xiaomi Redmi 5 plus - vince
Leads to: https://github.com/LineageOS/android_device_xiaomi_vince
If a device is found currently supported and trouble free in LineageOS a ROM builder may be able to build /e/ without having actual access to the device.