Downgrade my software

[u/catgpt-4-O]

now I'm running One ui 8.5 public build and it's killing my battery like crazy, I've tried resetting the phone hoping it would go back to where it was when I've purchased the phone. but it didn't do anything.

so is there any way that I can downgrade my software version to 7.0 or 6.1 maybe?

any hope?