I-539 Denied(H1 to H4 conversion)?

It is surprising that the USCIS did not request additional evidence regarding the extension of your spouse's H-1B status before making its...

CASE I485

If you applied again for an EAD, it is normal to get a second biometrics notice. Sometimes an applicant gets two notices even with the I-485 and...

Can I go for the ACS and asked to be fingerprinted with just the receipt? (I didn't receive an appointment notice yet)

I doubt that this will be successful with only the receipt notice.

Should I wait to file IR-5 for my parents until my brother gets a student visa?

If there is no rush to get your parents to the US, it makes sense to wait until your brother has a student visa before you petition for them.

Can I file a Writ of Mandamus for K-1 visa under AP, in this very special case.

Have you tried a constituent request through a senator's office to the DOS yet? If that doesn't help, a suit against DOS might be a next step.

Your passport together with your marriage certificate should be fine for your biometrics appointment.

Is it required to renew my Green card while N-400 naturalization application is in progress?

There are reasons that you may want to apply for a replacement green card. However, if you are certain that you will not travel internationally...

An immigrant visa is one that results in you becoming a permanent resident (green card holder). So if you never applied for such a visa, your...

Perhaps the RFE is for your concurrently filed I-485?

You may wish to consult with an immigration lawyer in person before deciding to submit a new N-400.