diff --git a/Tethering/apex/Android.bp b/Tethering/apex/Android.bp
index 96a4d20..24df5f6 100644
--- a/Tethering/apex/Android.bp
+++ b/Tethering/apex/Android.bp
@@ -17,6 +17,7 @@
 apex {
     name: "com.android.tethering",
     updatable: true,
+    min_sdk_version: "R",
     java_libs: ["framework-tethering"],
     apps: ["Tethering"],
     manifest: "manifest.json",
diff --git a/Tethering/jarjar-rules.txt b/Tethering/jarjar-rules.txt
index c6efa41..e90a2cc 100644
--- a/Tethering/jarjar-rules.txt
+++ b/Tethering/jarjar-rules.txt
@@ -8,7 +8,6 @@
 rule com.android.internal.util.IndentingPrintWriter.java* com.android.networkstack.tethering.util.IndentingPrintWriter.java@1
 rule com.android.internal.util.IState.java* com.android.networkstack.tethering.util.IState.java@1
 rule com.android.internal.util.MessageUtils* com.android.networkstack.tethering.util.MessageUtils@1
-rule com.android.internal.util.Preconditions* com.android.networkstack.tethering.util.Preconditions@1
 rule com.android.internal.util.State* com.android.networkstack.tethering.util.State@1
 rule com.android.internal.util.StateMachine* com.android.networkstack.tethering.util.StateMachine@1
 rule com.android.internal.util.TrafficStatsConstants* com.android.networkstack.tethering.util.TrafficStatsConstants@1
diff --git a/Tethering/src/android/net/dhcp/DhcpServingParamsParcelExt.java b/Tethering/src/android/net/dhcp/DhcpServingParamsParcelExt.java
index 82a26be..4f8ad8a 100644
--- a/Tethering/src/android/net/dhcp/DhcpServingParamsParcelExt.java
+++ b/Tethering/src/android/net/dhcp/DhcpServingParamsParcelExt.java
@@ -169,7 +169,7 @@
      * <p>If not set, the default value is null.
      */
     public DhcpServingParamsParcelExt setSingleClientAddr(@Nullable Inet4Address clientAddr) {
-        this.clientAddr = clientAddr == null ? 0 : inet4AddressToIntHTH(clientAddr);
+        this.singleClientAddr = clientAddr == null ? 0 : inet4AddressToIntHTH(clientAddr);
         return this;
     }
 
diff --git a/Tethering/src/com/android/networkstack/tethering/OffloadHardwareInterface.java b/Tethering/src/com/android/networkstack/tethering/OffloadHardwareInterface.java
index a29eef2..293f8ea 100644
--- a/Tethering/src/com/android/networkstack/tethering/OffloadHardwareInterface.java
+++ b/Tethering/src/com/android/networkstack/tethering/OffloadHardwareInterface.java
@@ -41,6 +41,7 @@
 import java.net.SocketAddress;
 import java.net.SocketException;
 import java.util.ArrayList;
+import java.util.NoSuchElementException;
 
 
 /**
@@ -143,7 +144,7 @@
         IOffloadConfig offloadConfig;
         try {
             offloadConfig = IOffloadConfig.getService(true /*retry*/);
-        } catch (RemoteException e) {
+        } catch (RemoteException | NoSuchElementException e) {
             mLog.e("getIOffloadConfig error " + e);
             return false;
         }
@@ -239,8 +240,8 @@
 
         if (mOffloadControl == null) {
             try {
-                mOffloadControl = IOffloadControl.getService();
-            } catch (RemoteException e) {
+                mOffloadControl = IOffloadControl.getService(true /*retry*/);
+            } catch (RemoteException | NoSuchElementException e) {
                 mLog.e("tethering offload control not supported: " + e);
                 return false;
             }
diff --git a/Tethering/src/com/android/networkstack/tethering/UpstreamNetworkMonitor.java b/Tethering/src/com/android/networkstack/tethering/UpstreamNetworkMonitor.java
index 25ddce4..320427c 100644
--- a/Tethering/src/com/android/networkstack/tethering/UpstreamNetworkMonitor.java
+++ b/Tethering/src/com/android/networkstack/tethering/UpstreamNetworkMonitor.java
@@ -43,7 +43,6 @@
 import android.util.SparseIntArray;
 
 import com.android.internal.annotations.VisibleForTesting;
-import com.android.internal.util.Preconditions;
 import com.android.internal.util.StateMachine;
 
 import java.util.HashMap;
@@ -591,7 +590,9 @@
         // Map from type to transports.
         final int notFound = -1;
         final int transport = sLegacyTypeToTransport.get(type, notFound);
-        Preconditions.checkArgument(transport != notFound, "unknown legacy type: " + type);
+        if (transport == notFound) {
+            throw new IllegalArgumentException("unknown legacy type: " + type);
+        }
         builder.addTransportType(transport);
 
         if (type == TYPE_MOBILE_DUN) {
diff --git a/Tethering/tests/unit/jarjar-rules.txt b/Tethering/tests/unit/jarjar-rules.txt
index 921fbed..1ea56cd 100644
--- a/Tethering/tests/unit/jarjar-rules.txt
+++ b/Tethering/tests/unit/jarjar-rules.txt
@@ -4,7 +4,6 @@
 rule com.android.internal.util.IndentingPrintWriter.java* com.android.networkstack.tethering.util.IndentingPrintWriter.java@1
 rule com.android.internal.util.IState.java* com.android.networkstack.tethering.util.IState.java@1
 rule com.android.internal.util.MessageUtils* com.android.networkstack.tethering.util.MessageUtils@1
-rule com.android.internal.util.Preconditions* com.android.networkstack.tethering.util.Preconditions@1
 rule com.android.internal.util.State* com.android.networkstack.tethering.util.State@1
 rule com.android.internal.util.StateMachine* com.android.networkstack.tethering.util.StateMachine@1
 rule com.android.internal.util.TrafficStatsConstants* com.android.networkstack.tethering.util.TrafficStatsConstants@1
diff --git a/Tethering/tests/unit/src/android/net/dhcp/DhcpServingParamsParcelExtTest.java b/Tethering/tests/unit/src/android/net/dhcp/DhcpServingParamsParcelExtTest.java
index f8eb147..a8857b2 100644
--- a/Tethering/tests/unit/src/android/net/dhcp/DhcpServingParamsParcelExtTest.java
+++ b/Tethering/tests/unit/src/android/net/dhcp/DhcpServingParamsParcelExtTest.java
@@ -110,7 +110,7 @@
     @Test
     public void testSetClientAddr() {
         mParcel.setSingleClientAddr(TEST_CLIENT_ADDRESS);
-        assertEquals(TEST_CLIENT_ADDRESS_PARCELED, mParcel.clientAddr);
+        assertEquals(TEST_CLIENT_ADDRESS_PARCELED, mParcel.singleClientAddr);
     }
 
     private static Inet4Address inet4Addr(String addr) {
diff --git a/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringTest.java b/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringTest.java
index 43946db..4471f64 100644
--- a/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringTest.java
+++ b/Tethering/tests/unit/src/com/android/networkstack/tethering/TetheringTest.java
@@ -1689,7 +1689,7 @@
         final DhcpServingParamsParcel params = dhcpParamsCaptor.getValue();
         assertEquals(serverAddr, intToInet4AddressHTH(params.serverAddr).getHostAddress());
         assertEquals(24, params.serverAddrPrefixLength);
-        assertEquals(clientAddrParceled, params.clientAddr);
+        assertEquals(clientAddrParceled, params.singleClientAddr);
     }
 
     @Test