diff --git a/bluetooth/audio/2.1/types.hal b/bluetooth/audio/2.1/types.hal
index 5604c38..e0dcc02 100644
--- a/bluetooth/audio/2.1/types.hal
+++ b/bluetooth/audio/2.1/types.hal
@@ -16,13 +16,14 @@
 
 package android.hardware.bluetooth.audio@2.1;
 
-import @2.0::PcmParameters;
-import @2.0::SessionType;
-import @2.0::SampleRate;
-import @2.0::ChannelMode;
 import @2.0::BitsPerSample;
-import @2.0::CodecConfiguration;
+import @2.0::ChannelMode;
 import @2.0::CodecCapabilities;
+import @2.0::CodecConfiguration;
+import @2.0::CodecType;
+import @2.0::PcmParameters;
+import @2.0::SampleRate;
+import @2.0::SessionType;
 
 enum SessionType : @2.0::SessionType {
     /** Used when encoded by Bluetooth Stack and streaming to LE Audio device */
@@ -35,6 +36,10 @@
     LE_AUDIO_HARDWARE_OFFLOAD_DECODING_DATAPATH,
 };
 
+enum CodecType : @2.0::CodecType {
+    LC3 = 0x20,
+};
+
 enum SampleRate : @2.0::SampleRate {
     RATE_8000 = 0x100,
     RATE_32000 = 0x200,
@@ -49,14 +54,57 @@
     uint32_t dataIntervalUs;
 };
 
-/** Used to configure either a Hardware or Software Encoding session based on session type */
-safe_union AudioConfiguration {
-    PcmParameters pcmConfig;
-    CodecConfiguration codecConfig;
+enum Lc3FrameDuration : uint8_t {
+    DURATION_10000US = 0x00,
+    DURATION_7500US = 0x01,
+};
+
+/**
+ * Used for Hardware Encoding/Decoding LC3 codec parameters.
+ */
+struct Lc3Parameters {
+    /* PCM is Input for encoder, Output for decoder */
+    BitsPerSample pcmBitDepth;
+
+    /* codec-specific parameters */
+    SampleRate samplingFrequency;
+    Lc3FrameDuration frameDuration;
+    /* length in octets of a codec frame */
+    uint32_t octetsPerFrame;
+    /* Number of blocks of codec frames per single SDU (Service Data Unit) */
+    uint8_t blocksPerSdu;
+};
+
+/**
+ * Used to specify the capabilities of the LC3 codecs supported by Hardware Encoding.
+ */
+struct Lc3CodecCapabilities {
+    /* This is bitfield, if bit N is set, HW Offloader supports N+1 channels at the same time.
+     * Example: 0x27 = 0b00100111: One, two, three or six channels supported.*/
+    uint8_t supportedChannelCounts;
+    Lc3Parameters lc3Capabilities;
 };
 
 /** Used to specify the capabilities of the different session types */
 safe_union AudioCapabilities {
     PcmParameters pcmCapabilities;
     CodecCapabilities codecCapabilities;
+    Lc3CodecCapabilities leAudioCapabilities;
 };
+
+/**
+ * Used to configure a LC3 Hardware Encoding session.
+ */
+struct Lc3CodecConfiguration {
+    /* This is also bitfield, specifying how the channels are ordered in the outgoing media packet.
+     * Bit meaning is defined in Bluetooth Assigned Numbers. */
+    uint32_t audioChannelAllocation;
+    Lc3Parameters lc3Config;
+};
+
+/** Used to configure either a Hardware or Software Encoding session based on session type */
+safe_union AudioConfiguration {
+    PcmParameters pcmConfig;
+    CodecConfiguration codecConfig;
+    Lc3CodecConfiguration leAudioCodecConfig;
+};
\ No newline at end of file
diff --git a/security/keymint/aidl/android/hardware/security/keymint/IRemotelyProvisionedComponent.aidl b/security/keymint/aidl/android/hardware/security/keymint/IRemotelyProvisionedComponent.aidl
index 1b09e9d..327e4a1 100644
--- a/security/keymint/aidl/android/hardware/security/keymint/IRemotelyProvisionedComponent.aidl
+++ b/security/keymint/aidl/android/hardware/security/keymint/IRemotelyProvisionedComponent.aidl
@@ -165,7 +165,7 @@
      *                protected: bstr .cbor {
      *                    1 : -8,                     // Algorithm : EdDSA
      *                },
-     *                unprotected: bstr .size 0
+     *                unprotected: { },
      *                payload: bstr .cbor SignatureKey,
      *                signature: bstr PureEd25519(.cbor SignatureKeySignatureInput)
      *            ]
@@ -190,7 +190,7 @@
      *                protected: bstr .cbor {
      *                    1 : -8,                     // Algorithm : EdDSA
      *                },
-     *                unprotected: bstr .size 0
+     *                unprotected: { },
      *                payload: bstr .cbor Eek,
      *                signature: bstr PureEd25519(.cbor EekSignatureInput)
      *            ]
@@ -239,7 +239,7 @@
      *                protected : bstr .cbor {
      *                    1 : 5,                           // Algorithm : HMAC-256
      *                },
-     *                unprotected : bstr .size 0,
+     *                unprotected : { },
      *                // Payload is PublicKeys from keysToSign argument, in provided order.
      *                payload: bstr .cbor [ * PublicKey ],
      *                tag: bstr
diff --git a/security/keymint/aidl/android/hardware/security/keymint/MacedPublicKey.aidl b/security/keymint/aidl/android/hardware/security/keymint/MacedPublicKey.aidl
index da85a50..cb5492d 100644
--- a/security/keymint/aidl/android/hardware/security/keymint/MacedPublicKey.aidl
+++ b/security/keymint/aidl/android/hardware/security/keymint/MacedPublicKey.aidl
@@ -29,7 +29,7 @@
      *
      *     MacedPublicKey = [                     // COSE_Mac0
      *         protected: bstr .cbor { 1 : 5},    // Algorithm : HMAC-256
-     *         unprotected: bstr .size 0,
+     *         unprotected: { },
      *         payload : bstr .cbor PublicKey,
      *         tag : bstr HMAC-256(K_mac, MAC_structure)
      *     ]
diff --git a/security/keymint/aidl/android/hardware/security/keymint/ProtectedData.aidl b/security/keymint/aidl/android/hardware/security/keymint/ProtectedData.aidl
index 1ec3bf0..438505e 100644
--- a/security/keymint/aidl/android/hardware/security/keymint/ProtectedData.aidl
+++ b/security/keymint/aidl/android/hardware/security/keymint/ProtectedData.aidl
@@ -80,7 +80,7 @@
      *         bstr .cbor {                    // Protected params
      *             1 : -8,                     // Algorithm : EdDSA
      *         },
-     *         bstr .size 0,                   // Unprotected params
+     *         { },                            // Unprotected params
      *         bstr .size 32,                  // MAC key
      *         bstr PureEd25519(DK_priv, .cbor SignedMac_structure)
      *     ]
@@ -127,7 +127,7 @@
      *         protected: bstr .cbor {
      *             1 : -8,                    // Algorithm : EdDSA
      *         },
-     *         unprotected: bstr .size 0,
+     *         unprotected: { },
      *         payload: bstr .cbor BccPayload,
      *         // First entry in the chain is signed by DK_pub, the others are each signed by their
      *         // immediate predecessor.  See RFC 8032 for signature representation.
diff --git a/security/keymint/aidl/default/RemotelyProvisionedComponent.cpp b/security/keymint/aidl/default/RemotelyProvisionedComponent.cpp
index 2373b26..749f0bc 100644
--- a/security/keymint/aidl/default/RemotelyProvisionedComponent.cpp
+++ b/security/keymint/aidl/default/RemotelyProvisionedComponent.cpp
@@ -156,7 +156,7 @@
         }
 
         auto protectedParms = macedKeyItem->asArray()->get(kCoseMac0ProtectedParams)->asBstr();
-        auto unprotectedParms = macedKeyItem->asArray()->get(kCoseMac0UnprotectedParams)->asBstr();
+        auto unprotectedParms = macedKeyItem->asArray()->get(kCoseMac0UnprotectedParams)->asMap();
         auto payload = macedKeyItem->asArray()->get(kCoseMac0Payload)->asBstr();
         auto tag = macedKeyItem->asArray()->get(kCoseMac0Tag)->asBstr();
         if (!protectedParms || !unprotectedParms || !payload || !tag) {
diff --git a/security/keymint/aidl/vts/functional/VtsRemotelyProvisionedComponentTests.cpp b/security/keymint/aidl/vts/functional/VtsRemotelyProvisionedComponentTests.cpp
index db53a8f..50e6cce 100644
--- a/security/keymint/aidl/vts/functional/VtsRemotelyProvisionedComponentTests.cpp
+++ b/security/keymint/aidl/vts/functional/VtsRemotelyProvisionedComponentTests.cpp
@@ -97,9 +97,9 @@
     ASSERT_NE(protParms, nullptr);
     ASSERT_EQ(cppbor::prettyPrint(protParms->value()), "{\n  1 : 5,\n}");
 
-    auto unprotParms = coseMac0->asArray()->get(kCoseMac0UnprotectedParams)->asBstr();
+    auto unprotParms = coseMac0->asArray()->get(kCoseMac0UnprotectedParams)->asMap();
     ASSERT_NE(unprotParms, nullptr);
-    ASSERT_EQ(unprotParms->value().size(), 0);
+    ASSERT_EQ(unprotParms->size(), 0);
 
     auto payload = coseMac0->asArray()->get(kCoseMac0Payload)->asBstr();
     ASSERT_NE(payload, nullptr);
@@ -150,9 +150,9 @@
     ASSERT_NE(protParms, nullptr);
     ASSERT_EQ(cppbor::prettyPrint(protParms->value()), "{\n  1 : 5,\n}");
 
-    auto unprotParms = coseMac0->asArray()->get(kCoseMac0UnprotectedParams)->asBstr();
+    auto unprotParms = coseMac0->asArray()->get(kCoseMac0UnprotectedParams)->asMap();
     ASSERT_NE(unprotParms, nullptr);
-    ASSERT_EQ(unprotParms->value().size(), 0);
+    ASSERT_EQ(unprotParms->size(), 0);
 
     auto payload = coseMac0->asArray()->get(kCoseMac0Payload)->asBstr();
     ASSERT_NE(payload, nullptr);
@@ -279,7 +279,7 @@
                                          .add(ALGORITHM, HMAC_256)
                                          .canonicalize()
                                          .encode())
-                            .add(cppbor::Bstr())             // unprotected
+                            .add(cppbor::Map())              // unprotected
                             .add(cppbor::Array().encode())   // payload (keysToSign)
                             .add(std::move(keysToSignMac));  // tag
 
@@ -364,7 +364,7 @@
                                          .add(ALGORITHM, HMAC_256)
                                          .canonicalize()
                                          .encode())
-                            .add(cppbor::Bstr())             // unprotected
+                            .add(cppbor::Map())              // unprotected
                             .add(cborKeysToSign_.encode())   // payload
                             .add(std::move(keysToSignMac));  // tag
 
diff --git a/security/keymint/support/cppcose.cpp b/security/keymint/support/cppcose.cpp
index c626ade..bafb2b6 100644
--- a/security/keymint/support/cppcose.cpp
+++ b/security/keymint/support/cppcose.cpp
@@ -85,7 +85,7 @@
 
     return cppbor::Array()
             .add(cppbor::Map().add(ALGORITHM, HMAC_256).canonicalize().encode())
-            .add(cppbor::Bstr() /* unprotected */)
+            .add(cppbor::Map() /* unprotected */)
             .add(payload)
             .add(tag.moveValue());
 }
@@ -97,7 +97,7 @@
     }
 
     auto protectedParms = mac->get(kCoseMac0ProtectedParams)->asBstr();
-    auto unprotectedParms = mac->get(kCoseMac0UnprotectedParams)->asBstr();
+    auto unprotectedParms = mac->get(kCoseMac0UnprotectedParams)->asMap();
     auto payload = mac->get(kCoseMac0Payload)->asBstr();
     auto tag = mac->get(kCoseMac0Tag)->asBstr();
     if (!protectedParms || !unprotectedParms || !payload || !tag) {
@@ -115,7 +115,7 @@
     }
 
     auto protectedParms = mac->get(kCoseMac0ProtectedParams)->asBstr();
-    auto unprotectedParms = mac->get(kCoseMac0UnprotectedParams)->asBstr();
+    auto unprotectedParms = mac->get(kCoseMac0UnprotectedParams)->asMap();
     auto payload = mac->get(kCoseMac0Payload)->asBstr();
     auto tag = mac->get(kCoseMac0Tag)->asBstr();
     if (!protectedParms || !unprotectedParms || !payload || !tag) {
@@ -168,7 +168,7 @@
 
     return cppbor::Array()
             .add(protParms)
-            .add(bytevec{} /* unprotected parameters */)
+            .add(cppbor::Map() /* unprotected parameters */)
             .add(payload)
             .add(*signature);
 }
@@ -185,7 +185,7 @@
     }
 
     const cppbor::Bstr* protectedParams = coseSign1->get(kCoseSign1ProtectedParams)->asBstr();
-    const cppbor::Bstr* unprotectedParams = coseSign1->get(kCoseSign1UnprotectedParams)->asBstr();
+    const cppbor::Map* unprotectedParams = coseSign1->get(kCoseSign1UnprotectedParams)->asMap();
     const cppbor::Bstr* payload = coseSign1->get(kCoseSign1Payload)->asBstr();
     const cppbor::Bstr* signature = coseSign1->get(kCoseSign1Signature)->asBstr();
 
diff --git a/security/keymint/support/remote_prov_utils.cpp b/security/keymint/support/remote_prov_utils.cpp
index 111cb30..3e4f3f7 100644
--- a/security/keymint/support/remote_prov_utils.cpp
+++ b/security/keymint/support/remote_prov_utils.cpp
@@ -83,7 +83,7 @@
     }
 
     const cppbor::Bstr* protectedParams = coseSign1->get(kCoseSign1ProtectedParams)->asBstr();
-    const cppbor::Bstr* unprotectedParams = coseSign1->get(kCoseSign1UnprotectedParams)->asBstr();
+    const cppbor::Map* unprotectedParams = coseSign1->get(kCoseSign1UnprotectedParams)->asMap();
     const cppbor::Bstr* payload = coseSign1->get(kCoseSign1Payload)->asBstr();
     const cppbor::Bstr* signature = coseSign1->get(kCoseSign1Signature)->asBstr();