Have you tried connecting device to Internet? Since 8-series oem unlock is disabled in dev options until this is done.Hi. I have a BE2029 and used the BE89AA (BE89BA didn't work, but I'm in uk). The phone is fully restored, but it looks like oem unlocking is grey'd out in the dev options. Which is unfortunate.
Edit: And `fastboot oem/flashing unlock` are both denied in fastboot.