XDA thread: https://forum.xda-developers.com/t/opnordce-oos-eb13da-unbrick-tool-to-restore-your-device-to-oxygenos.4332445/

Credits to https://forum.xda-developers.com/m/murchu27.11372625/ for 11.0.9.9.EB13BA file
Credits to https://forum.xda-developers.com/m/venkat-yadlapati.8507969/ for 11.0.4.4.EB13DA file