diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/securitytoken/SecurityTokenConnection.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/securitytoken/SecurityTokenConnection.java
index cefccd6e2..9b15b4ba7 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/securitytoken/SecurityTokenConnection.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/securitytoken/SecurityTokenConnection.java
@@ -90,6 +90,7 @@ public class SecurityTokenConnection {
 
     public void connectIfNecessary(Context context) throws IOException {
         if (isConnected()) {
+            refreshConnectionCapabilities();
             return;
         }
 
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/securitytoken/SecurityTokenInfo.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/securitytoken/SecurityTokenInfo.java
index b11586d4d..ecdb885e5 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/securitytoken/SecurityTokenInfo.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/securitytoken/SecurityTokenInfo.java
@@ -128,7 +128,8 @@ public abstract class SecurityTokenInfo implements Parcelable {
             TokenType.NITROKEY_START_OLD,
             TokenType.NITROKEY_START_1_25_AND_NEWER,
             TokenType.GNUK_OLD,
-            TokenType.GNUK_1_25_AND_NEWER
+            TokenType.GNUK_1_25_AND_NEWER,
+            TokenType.LEDGER_NANO_S
     )));
 
     private static final Set<TokenType> SUPPORTED_USB_SETUP = Collections.unmodifiableSet(new HashSet<>(Arrays.asList(
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/securitytoken/usb/CcidDescription.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/securitytoken/usb/CcidDescription.java
index 7c9db08b5..b0654faa2 100644
--- a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/securitytoken/usb/CcidDescription.java
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/securitytoken/usb/CcidDescription.java
@@ -25,6 +25,7 @@ import android.support.annotation.NonNull;
 import android.support.annotation.VisibleForTesting;
 
 import com.google.auto.value.AutoValue;
+import org.sufficientlysecure.keychain.securitytoken.usb.tpdu.T0ShortApduProtocol;
 import org.sufficientlysecure.keychain.securitytoken.usb.tpdu.T1ShortApduProtocol;
 import org.sufficientlysecure.keychain.securitytoken.usb.tpdu.T1TpduProtocol;
 
@@ -39,7 +40,7 @@ abstract class CcidDescription {
     private static final int FEATURE_AUTOMATIC_PPS = 0x00080;
 
     private static final int FEATURE_EXCHANGE_LEVEL_TPDU = 0x10000;
-    private static final int FEATURE_EXCHAGE_LEVEL_SHORT_APDU = 0x20000;
+    private static final int FEATURE_EXCHANGE_LEVEL_SHORT_APDU = 0x20000;
     private static final int FEATURE_EXCHAGE_LEVEL_EXTENDED_APDU = 0x40000;
 
     // bVoltageSupport Masks
@@ -49,6 +50,7 @@ abstract class CcidDescription {
 
     private static final int SLOT_OFFSET = 4;
     private static final int FEATURES_OFFSET = 40;
+    private static final short MASK_T0_PROTO = 1;
     private static final short MASK_T1_PROTO = 2;
 
     public abstract byte getMaxSlotIndex();
@@ -118,18 +120,29 @@ abstract class CcidDescription {
 
     CcidTransportProtocol getSuitableTransportProtocol() throws UsbTransportException {
         boolean hasT1Protocol = (getProtocols() & MASK_T1_PROTO) != 0;
-        if (!hasT1Protocol) {
-            throw new UsbTransportException("T=0 protocol is not supported!");
+        if (hasT1Protocol) {
+            if (hasFeature(CcidDescription.FEATURE_EXCHANGE_LEVEL_TPDU)) {
+                return new T1TpduProtocol();
+            } else if (hasFeature(CcidDescription.FEATURE_EXCHANGE_LEVEL_SHORT_APDU) ||
+                    hasFeature(CcidDescription.FEATURE_EXCHAGE_LEVEL_EXTENDED_APDU)) {
+                return new T1ShortApduProtocol();
+            } else {
+                throw new UsbTransportException("Character level exchange is not supported for T=1");
+            }
         }
 
-        if (hasFeature(CcidDescription.FEATURE_EXCHANGE_LEVEL_TPDU)) {
-            return new T1TpduProtocol();
-        } else if (hasFeature(CcidDescription.FEATURE_EXCHAGE_LEVEL_SHORT_APDU) ||
-                hasFeature(CcidDescription.FEATURE_EXCHAGE_LEVEL_EXTENDED_APDU)) {
-            return new T1ShortApduProtocol();
-        } else {
-            throw new UsbTransportException("Character level exchange is not supported");
+        boolean hasT0Protocol = (getProtocols() & MASK_T0_PROTO) != 0;
+        if (hasT0Protocol) {
+            if (hasFeature(CcidDescription.FEATURE_EXCHANGE_LEVEL_SHORT_APDU)) {
+                return new T0ShortApduProtocol();
+            } else if (hasFeature(CcidDescription.FEATURE_EXCHANGE_LEVEL_TPDU)) {
+                throw new UsbTransportException("TPDU level exchange is not supported for T=0");
+            } else {
+                throw new UsbTransportException("Character level exchange is not supported for T=0");
+            }
         }
+
+        throw new UsbTransportException("No suitable usb protocol supported");
     }
 
     boolean hasAutomaticPps() {
diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/securitytoken/usb/tpdu/T0ShortApduProtocol.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/securitytoken/usb/tpdu/T0ShortApduProtocol.java
new file mode 100644
index 000000000..63a15b20a
--- /dev/null
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/securitytoken/usb/tpdu/T0ShortApduProtocol.java
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2017 Schürmann & Breitmoser GbR
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.sufficientlysecure.keychain.securitytoken.usb.tpdu;
+
+
+import android.support.annotation.NonNull;
+
+import org.sufficientlysecure.keychain.securitytoken.usb.CcidTransceiver;
+import org.sufficientlysecure.keychain.securitytoken.usb.CcidTransceiver.CcidDataBlock;
+import org.sufficientlysecure.keychain.securitytoken.usb.CcidTransportProtocol;
+import org.sufficientlysecure.keychain.securitytoken.usb.UsbTransportException;
+
+
+public class T0ShortApduProtocol implements CcidTransportProtocol {
+    private CcidTransceiver ccidTransceiver;
+
+    public void connect(@NonNull CcidTransceiver transceiver) throws UsbTransportException {
+        ccidTransceiver = transceiver;
+        ccidTransceiver.iccPowerOn();
+    }
+
+    @Override
+    public byte[] transceive(@NonNull byte[] apdu) throws UsbTransportException {
+        CcidDataBlock response = ccidTransceiver.sendXfrBlock(apdu);
+        return response.getData();
+    }
+}