General Nonimmigrant Visa

The CBP (Customs and Border Protection) may find this pattern an unacceptable use of the visitor's visa. Generalizing for the sake of making a point, if in any twelve months your parents have spent more than six months in the United States, the CBP can hold that it appears your parents are living in the United States and visiting their home country instead of the other way around. More...

Note: Where transcribed from audio/video, this is a verbatim transcript of the referenced audio/video media delivered as oral communication, and, therefore, may not conform to written grammatical or syntactical form.

Note: Where transcribed from audio/video, this is a verbatim transcript of the referenced audio/video media delivered as oral communication, and, therefore, may not conform to written grammatical or syntactical form.

Note: Where transcribed from audio/video, this is a verbatim transcript of the referenced audio/video media delivered as oral communication, and, therefore, may not conform to written grammatical or syntactical form.

First of all you have to be in the United States to apply for your Adjustment of Status. Secondly in your case, because no new green card was started, your old employer must offer you the same job which you have to go and join eventually in good faith.
You can actually have I-485 filed through a job offer from employer A, the same job which was the basis of your green card. If you don't have that, you cannot file I-485. You can only file for I-485 /Adjustment of Status when your priority date is current and the job that is the basis of the green card is available to you right then. After 180 days of the I-485 pendency, you may never have to join the old employer because you can take a same or similar job anywhere. Just make sure that you have the good faith, honest intention of joining the old employer when you file the I-485. More...

Note: Where transcribed from audio/video, this is a verbatim transcript of the referenced audio/video media delivered as oral communication, and, therefore, may not conform to written grammatical or syntactical form.

It is great if you have the time and you can actually get the H-1B visa. If that is not possible what you can do is return on the advance parole. If you are coming to take up the same job which you had when you left and that job was an H-1B on a continuing H-1B, the Government will still consider you to be on H-1B. So returning on advance parole to take up the same job which you left on H-1B is considered to be a continuation of that H-1B. You can do H-1B extensions, transfers, etc., once you are in the U.S. More...

Note: Where transcribed from audio/video, this is a verbatim transcript of the referenced audio/video media delivered as oral communication, and, therefore, may not conform to written grammatical or syntactical form.