Hi everyone, similar to my threads for OP3, OP3T, OP5, OP5T and OP6 as unbrick tools allow to (obviously) unbrick your phone but also to rollback to specific versions of Oxygen OS I decided to search for more and succeeded in that.
I managed to find out 9.0.12, 9.0.13, 9.0.15 and 9.0.16 one (which is as of writing the latest available) but also the first one released for OOS 9.0.4 and linked to 9.0.11 , 9.0.6 and 9.0.5 packages shared by @iaTa in his thread and by @SpasilliumNexus in his AFH here
As the instructions and Qualcomm drivers are already available here , I don't feel a need to rewrite them.
You can ask questions here on how to use and issues, however I might not be able to answer immediately.
Here are the files uploaded on AndroidFileHost ordered by Android version: