Can I apply for H4 visa if my OPT extension is denied due to unpaid work

Can I apply for H4 visa if my OPT extension is denied due to unpaid work? I came to usa on H4 and then changed to F1. My OPT is about to finish and I want to return to H4 status. DO they ask for pay-stubs if apply for COS from F-1 to H4?