diff --git a/src/main/kotlin/provider/KeyAttestationCertPath.kt b/src/main/kotlin/provider/KeyAttestationCertPath.kt
index c26d1ed..8ce5fc6 100644
--- a/src/main/kotlin/provider/KeyAttestationCertPath.kt
+++ b/src/main/kotlin/provider/KeyAttestationCertPath.kt
@@ -111,7 +111,7 @@ class KeyAttestationCertPath(certs: List<X509Certificate>) : CertPath("X.509") {
 
   private fun isFactoryProvisioned(): Boolean {
     val rdn = parseDN(this.intermediateCert().subjectX500Principal.getName(X500Principal.RFC1779))
-    return rdn.containsKey(SERIAL_NUMBER_OID) && rdn[TITLE_OID] in setOf("TEE", "StrongBox")
+    return rdn.containsKey(SERIAL_NUMBER_OID)
   }
 
   // TODO(google-internal bug): Update this to use fields in the RKP root.
diff --git a/src/test/kotlin/provider/KeyAttestationCertPathTest.kt b/src/test/kotlin/provider/KeyAttestationCertPathTest.kt
index 09e8836..cf73b69 100644
--- a/src/test/kotlin/provider/KeyAttestationCertPathTest.kt
+++ b/src/test/kotlin/provider/KeyAttestationCertPathTest.kt
@@ -108,6 +108,10 @@ class KeyAttestationCertPathTest {
   }
 
   enum class ProvisioningMethodTestCase(val path: String, val expected: ProvisioningMethod) {
+    FACTORY_PROVISIONED_OLD_STYLE(
+      "sony-xperia10-iii/sdk33/TEE_EC",
+      ProvisioningMethod.FACTORY_PROVISIONED,
+    ),
     FACTORY_PROVISIONED("blueline/sdk28/TEE_EC_NONE", ProvisioningMethod.FACTORY_PROVISIONED),
     REMOTELY_PROVISIONED("caiman/sdk36/TEE_EC_RKP", ProvisioningMethod.REMOTELY_PROVISIONED),
     UNKNOWN("marlin/sdk29/TEE_EC_NONE", ProvisioningMethod.UNKNOWN),
diff --git a/testdata/sony-xperia10-iii/sdk33/TEE_EC.json b/testdata/sony-xperia10-iii/sdk33/TEE_EC.json
new file mode 100644
index 0000000..442a7b6
--- /dev/null
+++ b/testdata/sony-xperia10-iii/sdk33/TEE_EC.json
@@ -0,0 +1,41 @@
+{
+  "attestationVersion": "3",
+  "attestationSecurityLevel": "TRUSTED_ENVIRONMENT",
+  "keyMintVersion": "41",
+  "keyMintSecurityLevel": "TRUSTED_ENVIRONMENT",
+  "attestationChallenge": "Pq/k1d0AkN5aQrQytCSBr1zimWNlayWExZpJLeFtAMk=",
+  "uniqueId": "",
+  "softwareEnforced": {
+    "creationDateTime": "1780585145000",
+    "attestationApplicationId": {
+      "packages": [{ "name": "com.android.vending", "version": "85162330" }],
+      "signatures": ["8P1sW0EPJcslw7UzRsiXL64w+O50Ed+RBICtay1g24M="]
+    },
+    "areTagsOrdered": true
+  },
+  "hardwareEnforced": {
+    "purposes": ["2"],
+    "algorithms": "3",
+    "keySize": "256",
+    "digests": ["6"],
+    "ecCurve": "1",
+    "noAuthRequired": true,
+    "origin": "GENERATED",
+    "rootOfTrust": {
+      "verifiedBootKey": "gdG7IUVTlNoNf2DCV7dUWYDtUt/XyKiBbM88pwdDb54=",
+      "deviceLocked": true,
+      "verifiedBootState": "VERIFIED",
+      "verifiedBootHash": "UNZsaZbE8OV1KFQV9dBC0iDGeN7N1Bc79PHTAhz55KE="
+    },
+    "osVersion": "130000",
+    "osPatchLevel": "202307",
+    "attestationIdBrand": "docomo",
+    "attestationIdDevice": "SO-52B",
+    "attestationIdProduct": "SO-52B",
+    "attestationIdManufacturer": "Sony",
+    "attestationIdModel": "SO-52B",
+    "vendorPatchLevel": "20230701",
+    "bootPatchLevel": "20230701",
+    "areTagsOrdered": true
+  }
+}
diff --git a/testdata/sony-xperia10-iii/sdk33/TEE_EC.pem b/testdata/sony-xperia10-iii/sdk33/TEE_EC.pem
new file mode 100644
index 0000000..70e2c51
--- /dev/null
+++ b/testdata/sony-xperia10-iii/sdk33/TEE_EC.pem
@@ -0,0 +1,85 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
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+-----BEGIN CERTIFICATE-----
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+-----BEGIN CERTIFICATE-----
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