H1B Approved, Is my H4 EAD invalid ?

[Anand1141]

Hi,

My H1B (First h1b) got picked in the lottery and got approved 2 weeks back. I have a job offer. 

1. I already have approved H4 EAD. Is this still valid to work since the employer accepts only H4 EAD ?

2. If H4 EAD is not valid, what is the process to convert approved H1B to H4 back ?

 

Thanks in advance for any help on this.