diff --git a/src/LibHac/Keyset.cs b/src/LibHac/Keyset.cs
index 39b5538a..61b5140a 100644
--- a/src/LibHac/Keyset.cs
+++ b/src/LibHac/Keyset.cs
@@ -69,7 +69,36 @@ namespace LibHac
 
         public RSAParameters EticketExtKeyRsa { get; set; }
 
-        public byte[] NcaHdrFixedKeyModulus { get; } =
+        public bool KeysetForDev = false;
+        public byte[] NcaHdrFixedKeyModulus {
+            get {
+                if (KeysetForDev) {
+                    return Keyset.NcaHdrFixedKeyModulusDev;
+                } else {
+                    return Keyset.NcaHdrFixedKeyModulusProd;
+                }
+            }
+        }
+        public byte[] AcidFixedKeyModulus {
+            get {
+                if (KeysetForDev) {
+                    return Keyset.AcidFixedKeyModulusDev;
+                } else {
+                    return Keyset.AcidFixedKeyModulusProd;
+                }
+            }
+        }
+        public byte[] Package2FixedKeyModulus {
+            get {
+                if (KeysetForDev) {
+                    return Keyset.Package2FixedKeyModulusDev;
+                } else {
+                    return Keyset.Package2FixedKeyModulusProd;
+                }
+            }
+        }
+
+        private static readonly byte[] NcaHdrFixedKeyModulusProd =
         {
             0xBF, 0xBE, 0x40, 0x6C, 0xF4, 0xA7, 0x80, 0xE9, 0xF0, 0x7D, 0x0C, 0x99, 0x61, 0x1D, 0x77, 0x2F,
             0x96, 0xBC, 0x4B, 0x9E, 0x58, 0x38, 0x1B, 0x03, 0xAB, 0xB1, 0x75, 0x49, 0x9F, 0x2B, 0x4D, 0x58,
@@ -89,7 +118,7 @@ namespace LibHac
             0x04, 0x40, 0x1A, 0x9E, 0x9A, 0x67, 0xF6, 0x72, 0x29, 0xFA, 0x04, 0xF0, 0x9D, 0xE4, 0xF4, 0x03
         };
 
-        public byte[] AcidFixedKeyModulus { get; } =
+        private static readonly byte[] AcidFixedKeyModulusProd =
         {
             0xDD, 0xC8, 0xDD, 0xF2, 0x4E, 0x6D, 0xF0, 0xCA, 0x9E, 0xC7, 0x5D, 0xC7, 0x7B, 0xAD, 0xFE, 0x7D,
             0x23, 0x89, 0x69, 0xB6, 0xF2, 0x06, 0xA2, 0x02, 0x88, 0xE1, 0x55, 0x91, 0xAB, 0xCB, 0x4D, 0x50,
@@ -109,7 +138,7 @@ namespace LibHac
             0x5B, 0x32, 0x4C, 0x37, 0xEF, 0xB1, 0x71, 0x68, 0x53, 0x0A, 0xED, 0x51, 0x7D, 0x35, 0x22, 0xFD
         };
 
-        public byte[] Package2FixedKeyModulus { get; } =
+        private static readonly byte[] Package2FixedKeyModulusProd =
         {
             0x8D, 0x13, 0xA7, 0x77, 0x6A, 0xE5, 0xDC, 0xC0, 0x3B, 0x25, 0xD0, 0x58, 0xE4, 0x20, 0x69, 0x59,
             0x55, 0x4B, 0xAB, 0x70, 0x40, 0x08, 0x28, 0x07, 0xA8, 0xA7, 0xFD, 0x0F, 0x31, 0x2E, 0x11, 0xFE,
@@ -129,6 +158,66 @@ namespace LibHac
             0x49, 0x50, 0x95, 0x8C, 0x55, 0x80, 0x7E, 0x39, 0xB1, 0x48, 0x05, 0x1E, 0x21, 0xC7, 0x24, 0x4F
         };
 
+        private static readonly byte[] NcaHdrFixedKeyModulusDev =
+        {
+            0xD8, 0xF1, 0x18, 0xEF, 0x32, 0x72, 0x4C, 0xA7, 0x47, 0x4C, 0xB9, 0xEA, 0xB3, 0x04, 0xA8, 0xA4,
+            0xAC, 0x99, 0x08, 0x08, 0x04, 0xBF, 0x68, 0x57, 0xB8, 0x43, 0x94, 0x2B, 0xC7, 0xB9, 0x66, 0x49,
+            0x85, 0xE5, 0x8A, 0x9B, 0xC1, 0x00, 0x9A, 0x6A, 0x8D, 0xD0, 0xEF, 0xCE, 0xFF, 0x86, 0xC8, 0x5C,
+            0x5D, 0xE9, 0x53, 0x7B, 0x19, 0x2A, 0xA8, 0xC0, 0x22, 0xD1, 0xF3, 0x22, 0x0A, 0x50, 0xF2, 0x2B,
+            0x65, 0x05, 0x1B, 0x9E, 0xEC, 0x61, 0xB5, 0x63, 0xA3, 0x6F, 0x3B, 0xBA, 0x63, 0x3A, 0x53, 0xF4,
+            0x49, 0x2F, 0xCF, 0x03, 0xCC, 0xD7, 0x50, 0x82, 0x1B, 0x29, 0x4F, 0x08, 0xDE, 0x1B, 0x6D, 0x47,
+            0x4F, 0xA8, 0xB6, 0x6A, 0x26, 0xA0, 0x83, 0x3F, 0x1A, 0xAF, 0x83, 0x8F, 0x0E, 0x17, 0x3F, 0xFE,
+            0x44, 0x1C, 0x56, 0x94, 0x2E, 0x49, 0x83, 0x83, 0x03, 0xE9, 0xB6, 0xAD, 0xD5, 0xDE, 0xE3, 0x2D,
+            0xA1, 0xD9, 0x66, 0x20, 0x5D, 0x1F, 0x5E, 0x96, 0x5D, 0x5B, 0x55, 0x0D, 0xD4, 0xB4, 0x77, 0x6E,
+            0xAE, 0x1B, 0x69, 0xF3, 0xA6, 0x61, 0x0E, 0x51, 0x62, 0x39, 0x28, 0x63, 0x75, 0x76, 0xBF, 0xB0,
+            0xD2, 0x22, 0xEF, 0x98, 0x25, 0x02, 0x05, 0xC0, 0xD7, 0x6A, 0x06, 0x2C, 0xA5, 0xD8, 0x5A, 0x9D,
+            0x7A, 0xA4, 0x21, 0x55, 0x9F, 0xF9, 0x3E, 0xBF, 0x16, 0xF6, 0x07, 0xC2, 0xB9, 0x6E, 0x87, 0x9E,
+            0xB5, 0x1C, 0xBE, 0x97, 0xFA, 0x82, 0x7E, 0xED, 0x30, 0xD4, 0x66, 0x3F, 0xDE, 0xD8, 0x1B, 0x4B,
+            0x15, 0xD9, 0xFB, 0x2F, 0x50, 0xF0, 0x9D, 0x1D, 0x52, 0x4C, 0x1C, 0x4D, 0x8D, 0xAE, 0x85, 0x1E,
+            0xEA, 0x7F, 0x86, 0xF3, 0x0B, 0x7B, 0x87, 0x81, 0x98, 0x23, 0x80, 0x63, 0x4F, 0x2F, 0xB0, 0x62,
+            0xCC, 0x6E, 0xD2, 0x46, 0x13, 0x65, 0x2B, 0xD6, 0x44, 0x33, 0x59, 0xB5, 0x8F, 0xB9, 0x4A, 0xA9
+        };
+
+        private static readonly byte[] AcidFixedKeyModulusDev =
+        {
+            0xD6, 0x34, 0xA5, 0x78, 0x6C, 0x68, 0xCE, 0x5A, 0xC2, 0x37, 0x17, 0xF3, 0x82, 0x45, 0xC6, 0x89,
+            0xE1, 0x2D, 0x06, 0x67, 0xBF, 0xB4, 0x06, 0x19, 0x55, 0x6B, 0x27, 0x66, 0x0C, 0xA4, 0xB5, 0x87,
+            0x81, 0x25, 0xF4, 0x30, 0xBC, 0x53, 0x08, 0x68, 0xA2, 0x48, 0x49, 0x8C, 0x3F, 0x38, 0x40, 0x9C,
+            0xC4, 0x26, 0xF4, 0x79, 0xE2, 0xA1, 0x85, 0xF5, 0x5C, 0x7F, 0x58, 0xBA, 0xA6, 0x1C, 0xA0, 0x8B,
+            0x84, 0x16, 0x14, 0x6F, 0x85, 0xD9, 0x7C, 0xE1, 0x3C, 0x67, 0x22, 0x1E, 0xFB, 0xD8, 0xA7, 0xA5,
+            0x9A, 0xBF, 0xEC, 0x0E, 0xCF, 0x96, 0x7E, 0x85, 0xC2, 0x1D, 0x49, 0x5D, 0x54, 0x26, 0xCB, 0x32,
+            0x7C, 0xF6, 0xBB, 0x58, 0x03, 0x80, 0x2B, 0x5D, 0xF7, 0xFB, 0xD1, 0x9D, 0xC7, 0xC6, 0x2E, 0x53,
+            0xC0, 0x6F, 0x39, 0x2C, 0x1F, 0xA9, 0x92, 0xF2, 0x4D, 0x7D, 0x4E, 0x74, 0xFF, 0xE4, 0xEF, 0xE4,
+            0x7C, 0x3D, 0x34, 0x2A, 0x71, 0xA4, 0x97, 0x59, 0xFF, 0x4F, 0xA2, 0xF4, 0x66, 0x78, 0xD8, 0xBA,
+            0x99, 0xE3, 0xE6, 0xDB, 0x54, 0xB9, 0xE9, 0x54, 0xA1, 0x70, 0xFC, 0x05, 0x1F, 0x11, 0x67, 0x4B,
+            0x26, 0x8C, 0x0C, 0x3E, 0x03, 0xD2, 0xA3, 0x55, 0x5C, 0x7D, 0xC0, 0x5D, 0x9D, 0xFF, 0x13, 0x2F,
+            0xFD, 0x19, 0xBF, 0xED, 0x44, 0xC3, 0x8C, 0xA7, 0x28, 0xCB, 0xE5, 0xE0, 0xB1, 0xA7, 0x9C, 0x33,
+            0x8D, 0xB8, 0x6E, 0xDE, 0x87, 0x18, 0x22, 0x60, 0xC4, 0xAE, 0xF2, 0x87, 0x9F, 0xCE, 0x09, 0x5C,
+            0xB5, 0x99, 0xA5, 0x9F, 0x49, 0xF2, 0xD7, 0x58, 0xFA, 0xF9, 0xC0, 0x25, 0x7D, 0xD6, 0xCB, 0xF3,
+            0xD8, 0x6C, 0xA2, 0x69, 0x91, 0x68, 0x73, 0xB1, 0x94, 0x6F, 0xA3, 0xF3, 0xB9, 0x7D, 0xF8, 0xE0,
+            0x72, 0x9E, 0x93, 0x7B, 0x7A, 0xA2, 0x57, 0x60, 0xB7, 0x5B, 0xA9, 0x84, 0xAE, 0x64, 0x88, 0x69
+        };
+
+        private static readonly byte[] Package2FixedKeyModulusDev =
+        {
+            0xB3, 0x65, 0x54, 0xFB, 0x0A, 0xB0, 0x1E, 0x85, 0xA7, 0xF6, 0xCF, 0x91, 0x8E, 0xBA, 0x96, 0x99,
+            0x0D, 0x8B, 0x91, 0x69, 0x2A, 0xEE, 0x01, 0x20, 0x4F, 0x34, 0x5C, 0x2C, 0x4F, 0x4E, 0x37, 0xC7,
+            0xF1, 0x0B, 0xD4, 0xCD, 0xA1, 0x7F, 0x93, 0xF1, 0x33, 0x59, 0xCE, 0xB1, 0xE9, 0xDD, 0x26, 0xE6,
+            0xF3, 0xBB, 0x77, 0x87, 0x46, 0x7A, 0xD6, 0x4E, 0x47, 0x4A, 0xD1, 0x41, 0xB7, 0x79, 0x4A, 0x38,
+            0x06, 0x6E, 0xCF, 0x61, 0x8F, 0xCD, 0xC1, 0x40, 0x0B, 0xFA, 0x26, 0xDC, 0xC0, 0x34, 0x51, 0x83,
+            0xD9, 0x3B, 0x11, 0x54, 0x3B, 0x96, 0x27, 0x32, 0x9A, 0x95, 0xBE, 0x1E, 0x68, 0x11, 0x50, 0xA0,
+            0x6B, 0x10, 0xA8, 0x83, 0x8B, 0xF5, 0xFC, 0xBC, 0x90, 0x84, 0x7A, 0x5A, 0x5C, 0x43, 0x52, 0xE6,
+            0xC8, 0x26, 0xE9, 0xFE, 0x06, 0xA0, 0x8B, 0x53, 0x0F, 0xAF, 0x1E, 0xC4, 0x1C, 0x0B, 0xCF, 0x50,
+            0x1A, 0xA4, 0xF3, 0x5C, 0xFB, 0xF0, 0x97, 0xE4, 0xDE, 0x32, 0x0A, 0x9F, 0xE3, 0x5A, 0xAA, 0xB7,
+            0x44, 0x7F, 0x5C, 0x33, 0x60, 0xB9, 0x0F, 0x22, 0x2D, 0x33, 0x2A, 0xE9, 0x69, 0x79, 0x31, 0x42,
+            0x8F, 0xE4, 0x3A, 0x13, 0x8B, 0xE7, 0x26, 0xBD, 0x08, 0x87, 0x6C, 0xA6, 0xF2, 0x73, 0xF6, 0x8E,
+            0xA7, 0xF2, 0xFE, 0xFB, 0x6C, 0x28, 0x66, 0x0D, 0xBD, 0xD7, 0xEB, 0x42, 0xA8, 0x78, 0xE6, 0xB8,
+            0x6B, 0xAE, 0xC7, 0xA9, 0xE2, 0x40, 0x6E, 0x89, 0x20, 0x82, 0x25, 0x8E, 0x3C, 0x6A, 0x60, 0xD7,
+            0xF3, 0x56, 0x8E, 0xEC, 0x8D, 0x51, 0x8A, 0x63, 0x3C, 0x04, 0x78, 0x23, 0x0E, 0x90, 0x0C, 0xB4,
+            0xE7, 0x86, 0x3B, 0x4F, 0x8E, 0x13, 0x09, 0x47, 0x32, 0x0E, 0x04, 0xB8, 0x4D, 0x5B, 0xB0, 0x46,
+            0x71, 0xB0, 0x5C, 0xF4, 0xAD, 0x63, 0x4F, 0xC5, 0xE2, 0xAC, 0x1E, 0xC4, 0x33, 0x96, 0x09, 0x7B
+        };
+
         public Dictionary<byte[], byte[]> TitleKeys { get; } = new Dictionary<byte[], byte[]>(new ByteArray128BitComparer());
 
         public void SetSdSeed(byte[] sdseed)
@@ -405,10 +494,10 @@ namespace LibHac
             keyset.DeriveKeys(logger);
         }
 
-        public static Keyset ReadKeyFile(string filename, string titleKeysFilename = null, string consoleKeysFilename = null, IProgressReport logger = null)
+        public static Keyset ReadKeyFile(string filename, string titleKeysFilename = null, string consoleKeysFilename = null, IProgressReport logger = null, bool dev = false)
         {
             var keyset = new Keyset();
-
+            keyset.KeysetForDev = dev;
             ReadKeyFile(keyset, filename, titleKeysFilename, consoleKeysFilename, logger);
 
             return keyset;
diff --git a/src/hactoolnet/Program.cs b/src/hactoolnet/Program.cs
index 9f39a649..112b7db1 100644
--- a/src/hactoolnet/Program.cs
+++ b/src/hactoolnet/Program.cs
@@ -169,7 +169,7 @@ namespace hactoolnet
                 consoleKeyFile = homeConsoleKeyFile;
             }
 
-            ctx.Keyset = ExternalKeys.ReadKeyFile(keyFile, titleKeyFile, consoleKeyFile, ctx.Logger);
+            ctx.Keyset = ExternalKeys.ReadKeyFile(keyFile, titleKeyFile, consoleKeyFile, ctx.Logger, ctx.Options.UseDevKeys);
             if (ctx.Options.SdSeed != null)
             {
                 ctx.Keyset.SetSdSeed(ctx.Options.SdSeed.ToBytes());