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HelloThis is Samuel. I suggest you can apply for Clemency/Pardon under Texas law and then follow up with a Petition to the courts for an Expumgment. You can read the TX code on that here.
Here is a link for the forms. You should apply for a Full Pardon.
Now keep in mind the following:This is not an overnight process. It could take nearly 2 years depending on backlog for an investigation to even begin.This is only a first step. You will then need to Petition the court for an expungment of the conviction. The Clemency does not guarantee the court will grant your expungment.
In the left menu of THIS LINK you can click onto "clemency" and read more.