diff --git a/app-common/src/main/java/im/angry/openeuicc/core/DefaultEuiccChannelManager.kt b/app-common/src/main/java/im/angry/openeuicc/core/DefaultEuiccChannelManager.kt
index 74ec285..0f6e6b3 100644
--- a/app-common/src/main/java/im/angry/openeuicc/core/DefaultEuiccChannelManager.kt
+++ b/app-common/src/main/java/im/angry/openeuicc/core/DefaultEuiccChannelManager.kt
@@ -55,7 +55,7 @@ open class DefaultEuiccChannelManager(
             parseIsdrAidList(appContainer.preferenceRepository.isdrAidListFlow.first())
 
         return isdrAidList.firstNotNullOfOrNull {
-            Log.i(TAG, "Opening channel, trying ISDR AID ${it.encodeHex()}")
+            Log.i(TAG, "Opening channel, trying ISD-R AID: ${it.encodeHex()}")
 
             openFn(it)?.let { channel ->
                 if (channel.valid) {
@@ -277,11 +277,7 @@ open class DefaultEuiccChannelManager(
                 )
                 try {
                     val channel = tryOpenChannelFirstValidAid {
-                        euiccChannelFactory.tryOpenUsbEuiccChannel(
-                            device,
-                            iface,
-                            it
-                        )
+                        euiccChannelFactory.tryOpenUsbEuiccChannel(device, iface, it)
                     }
                     if (channel != null && channel.lpa.valid) {
                         usbChannel = channel
diff --git a/app-common/src/main/java/im/angry/openeuicc/core/usb/UsbApduInterface.kt b/app-common/src/main/java/im/angry/openeuicc/core/usb/UsbApduInterface.kt
index 31ba333..8511a0e 100644
--- a/app-common/src/main/java/im/angry/openeuicc/core/usb/UsbApduInterface.kt
+++ b/app-common/src/main/java/im/angry/openeuicc/core/usb/UsbApduInterface.kt
@@ -53,7 +53,7 @@ class UsbApduInterface(
             "A9088100820101830107".decodeHex(),
             le = null,
         )
-        transmitApduByChannel(terminalCapabilities, 0,)
+        transmitApduByChannel(terminalCapabilities, 0)
     }
 
     override fun disconnect() {
@@ -70,12 +70,12 @@ class UsbApduInterface(
             transmitApduByChannel(req, 0)
         } catch (e: Exception) {
             e.printStackTrace()
-            return -1
+            return 0
         }
 
         if (!isSuccessResponse(resp)) {
             Log.d(TAG, "OPEN LOGICAL CHANNEL failed: ${resp.encodeHex()}")
-            return -1
+            return 0
         }
 
         val channelId = resp[0].toInt()
@@ -87,7 +87,7 @@ class UsbApduInterface(
 
         if (!isSuccessResponse(selectAidResp)) {
             Log.d(TAG, "Select DF failed : ${selectAidResp.encodeHex()}")
-            return -1
+            return 0
         }
 
         channels.add(channelId)
diff --git a/app-common/src/main/java/im/angry/openeuicc/util/StringUtils.kt b/app-common/src/main/java/im/angry/openeuicc/util/StringUtils.kt
index 9f993a3..99cf0b3 100644
--- a/app-common/src/main/java/im/angry/openeuicc/util/StringUtils.kt
+++ b/app-common/src/main/java/im/angry/openeuicc/util/StringUtils.kt
@@ -36,6 +36,7 @@ fun formatFreeSpace(size: Int): String =
 fun parseIsdrAidList(s: String): List<ByteArray> =
     s.split('\n').map(String::trim).filter { !it.startsWith('#') }
         .map(String::trim)
+        .filter(String::isNotEmpty)
         .mapNotNull {
             try {
                 it.decodeHex()