diff --git a/app/src/main/java/app/universal/patch/manager/util/PM.kt b/app/src/main/java/app/universal/patch/manager/util/PM.kt
index 0c8c937c..d3a75fb1 100644
--- a/app/src/main/java/app/universal/patch/manager/util/PM.kt
+++ b/app/src/main/java/app/universal/patch/manager/util/PM.kt
@@ -249,16 +249,14 @@ class PM(
             )
         val signingFlags = if (includeSigning) {
             if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
-                val modernFlag = PackageManager.GET_SIGNING_CERTIFICATES.toLong()
-                // Android 9/10 only collect archive certificates when GET_SIGNATURES is also set.
-                // Keep SigningInfo for the current signer and verified certificate rotation history.
-                // https://android.googlesource.com/platform/frameworks/base/+/android-10.0.0_r47/core/java/android/content/pm/PackageManager.java
+                // Always include GET_SIGNATURES alongside GET_SIGNING_CERTIFICATES: Android 9/10
+                // and several Android 11-13 OEM builds (e.g., Unisoc/Alldocube Android 13) gate
+                // PackageParser.collectCertificates() in getPackageArchiveInfo() on
+                // (flags & GET_SIGNATURES) != 0 while still populating SigningInfo when
+                // GET_SIGNING_CERTIFICATES is set.
                 @Suppress("DEPRECATION")
-                if (Build.VERSION.SDK_INT < Build.VERSION_CODES.R) {
-                    modernFlag or PackageManager.GET_SIGNATURES.toLong()
-                } else {
-                    modernFlag
-                }
+                PackageManager.GET_SIGNING_CERTIFICATES.toLong() or
+                    PackageManager.GET_SIGNATURES.toLong()
             } else {
                 @Suppress("DEPRECATION")
                 PackageManager.GET_SIGNATURES.toLong()
diff --git a/app/src/test/scripts/archive-signing-test.py b/app/src/test/scripts/archive-signing-test.py
index 70e39e2c..ff527678 100644
--- a/app/src/test/scripts/archive-signing-test.py
+++ b/app/src/test/scripts/archive-signing-test.py
@@ -74,7 +74,8 @@ class PackageInfoFlags private constructor(val value: Long) {
         // https://android.googlesource.com/platform/frameworks/base/+/android-10.0.0_r47/core/java/android/content/pm/PackageManager.java
         val legacy = flags and GET_SIGNATURES.toLong() != 0L
         val modern = flags and GET_SIGNING_CERTIFICATES.toLong() != 0L
-        val collect = legacy || (Build.VERSION.SDK_INT >= 30 && modern)
+        // Android 9/10 and some Android 11-13 OEM frameworks gate collectCertificates on GET_SIGNATURES alone.
+        val collect = legacy
         if (collect && !validSignature) return null
         return PackageInfo().apply {
             if (collect && legacy) signatures = history?.take(1)?.toTypedArray() ?: current
@@ -130,7 +131,7 @@ class Reader {
         val flags = manager.lastFlags
         check(flags and PackageManager.GET_META_DATA.toLong() != 0L)
         check(flags and PackageManager.GET_ACTIVITIES.toLong() != 0L)
-        check((flags and PackageManager.GET_SIGNATURES.toLong() != 0L) == (sdk < 30))
+        check(flags and PackageManager.GET_SIGNATURES.toLong() != 0L)
         check((flags and PackageManager.GET_SIGNING_CERTIFICATES.toLong() != 0L) == (sdk >= 28))
 
         // Multi-signer identities must still require every signer.