Is it possible to change status from H4 Visa to H1B with just having the H1B Petition Approval(2013) & NOT the STAMPING

Hi,
I’m in H4 currently. I have got my H1B Petition Approved in 2013, but never got it stamped.
Travelled to US in H4.

Is it possible to change status from H4 to H1B without the stamping ?
If its possible, what is the process to do it.
Thanking in advance