Question details
My spouse is on H-1 visa and his former employer filed I-140 and then my spouse changed his employment to another employer and transferred his H-1, the I-140 has not been revoked by former employer. So my H-4 is with the former employer valid for three years, and current employer for my spouse has not filed H-1 for me. Is the H-4 from the former employer valid for file EAD or do I have to apply for H-4 again and what would be the documents that would I need to file H-4 EAD ?
Every time the H-1 holder changes job, the H-4 holder does not need to re -apply for H-4. Your H-4 is good. You don't have to have different H-4 for the employer. Of course, every time the H-1 holders change their job they have apply for new H-1 but as long as you never violated status and H-1 holder has never violated status that H-4 continued to be good from job to job to job, you are good.
Your second question was what document need to file H-4 EAD?
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