Developer options enabled? Click build number 7 or so times. Might be able to unlock it from the developer options which should now be in your settings menu. If not:
Since it is a Mediatek 6739 chipset I’d try the command “fastboot oem unlock” from the adb and fastboot commands you can get online. First hook your watch up to your computer, open a command prompt and type “adb devices” and you should see a hex number. Then type “fastboot devices” and you should also see a Hex number shown. There are directions around here for the Kospet Prime and maybe the Rollme S08. For better directions try finding those and I think it will be covered in better detail than I have given here.
NOTE: Unlocking your bootloader will likely wipe all your DATA. So if you have a lot of things and apps setup with data it will be wiped.