Can I change to previous client while my h1 is in progress

My H1b is filed on Client A and then I moved to Client B while H1b is in progress. New LCA and amendment filed with Client B. Now, I wanted to move to Client A. Still my H1B is in progress. so is there any way that I can move the to Client A. If so please let me know what is the process.

Note: recently got opt extension for 2 yrs.