Was Nelson entitled to a new venire panel after changing his pleas from guilty to not guilty?

QUESTION(S) PRESENTED ISSUE 1: THE VENIRE PANEL WAS INFORMED THAT NELSON HAD PLEAD GOLLTY To ALL Five CHARGES. WHEN NELSON CHANGE THOSE PLEAS BEFORE THE TRIAL bN ~ : THE MERITS 8EGAN To NOT GULLTY, Was HE ENTITLED To A NEW VENLRE PURSUANT To THE RIGHT To TRLAL. BY JURY FOUND IN ARTICLE 1, SECTION 15 of THE TEXAS CONSTITUTION AND TEXAS CoDE OF CALMLNAL. PROCEDURE ARTICLE 1.42 ? ISSUE 2: THE VEWLRE PAWEL WAS LNFORMED THAT NELSON Had PLEAD GULLTY To ALL FIVE CHARGES. WHEU NELSON CHANGE THOSE PLEAS BEFORE THE TATAL ON . THE MERLTS REGAN To NoT GUILTY, WAS HE ENTLTLED To A NEW VENIRE , PANEL PURSUANT To THE RIGHT Yo TRIAL AY JURY FOUND IN THE SDCTH AMENDMENT To THE UNITED STATES CoNSTLTUTION ? i