MEMORANDUM

Brian Williams, Warden, Nevada Southern District Corrections Center, and the Nevada Attorney General (collectively “the State”) appeal the district court’s grant of a writ of habeas corpus to Clarence Elliot. See 28 U.S.C. § 2254 . We affirm.

The State asserts that Elliot’s right to due process under the Fourteenth Amendment to the United States Constitution was not violated when the jury at his trial was improperly instructed on the deliberation element of first degree murder. See Nev.Rev.Stat. § 200.030(l)(a). We disagree.

At the time it decided Elliot’s case, the Nevada Supreme Court had determined that the instruction regarding deliberation given at Elliot’s trial was no longer proper, but that the new instructional requirements would not apply to defendants, like Elliot, even though their cases were not final when the new requirements were adopted. However, we later decided that a failure to apply the new requirements to those defendants violated their due process rights. See Babb v. Lozowsky, 719 F.3d 1019, 1030-33 (9th Cir.2013). Of course, to be entitled to relief, Elliot was required to show that the error was not harmless, but the State does not argue that it was harmless. Moreover, on this record, we would be hard pressed to find harmless error; at the very least there is grave doubt that it was harmless. See O’Neal v. McAninch, 513 U.S. 432, 437-38 , 115 S.Ct. 992, 995 , 130 L.Ed.2d 947 (1995); Coleman v. Calderon, 210 F.3d 1047, 1051 (9th Cir.2000). The State does briefly suggest that because after Elliot filed his petition for habeas corpus relief in the district court, the Nevada Supreme Court indicated that it would give relief in cases that were not final, he should have returned to the State courts. However, he had already invoked “one complete round of the State’s established appellate review pro cess,” and he was not required to do more.

AFFIRMED.

This disposition is not appropriate for publication and is not precedent except as provided by 9th Cir. R. 36-3. .Incidentally, the Nevada Supreme Court agrees that its prior position was erroneous. See Nika v. State, 124 Nev. 1272, 1287 , 198 P.3d 839, 850 (2008). . See Fry v. Pliler, 551 U.S. 112, 116 , 127 S.Ct. 2321, 2325 , 168 L.Ed.2d 16 (2007); Brecht v. Abrahamson, 507 U.S. 619, 637-38 , 113 S.Ct. 1710, 1722 , 123 L.Ed.2d 353 (1993). . Arguments that are not raised in the opening brief are waived. See Brooks v. City of San Mateo, 229 F.3d 917 , 922 n. 1 (9th Cir.2000); see also Greenwood v. FAA, 28 F.3d 971, 977 (9th Cir.1994). . See O’Sullivan v. Boerckel, 526 U.S. 838, 845 , 119 S.Ct. 1728, 1732 , 144 L.Ed.2d 1 (1999); see also Greene v. Lambert, 288 F.3d 1081, 1086 (9th Cir.2002).