A forfeited Texas LLC can't change its registered agent until it is reinstated, and reinstatement doesn't update the agent either. Here is the two step order that gets both fixed, and what is at risk while you wait.

A forfeited Texas business loses its right to operate, sign contracts, and sue in Texas courts. Officers and directors can be held personally liable for debts incurred after forfeiture. Most forfeitures are fixable quickly once missing franchise tax reports are filed. Here is exactly what happened, what is at risk, and the six-stage process to restore good standing.