diff --git a/README.md b/README.md
index d92b647f..e4e1c982 100644
--- a/README.md
+++ b/README.md
@@ -164,6 +164,6 @@ If some of these are unavailable, you can alternatively install a recent version
 
 Wi-Fi driver `wpa_supplicant`:
 
-* P2P configuration file is assumed to be saved to `/data/misc/wifi/p2p_supplicant.conf` or
-  `/data/vendor/wifi/wpa/p2p_supplicant.conf` for API 28+ and have reasonable format;
+* P2P configuration file is assumed to be saved to `/data/vendor/wifi/wpa/p2p_supplicant.conf` or
+  `/data/misc/wifi/p2p_supplicant.conf` and have reasonable format;
 * Android system is expected to restart `wpa_supplicant` after it crashes.
diff --git a/mobile/src/main/java/be/mygod/vpnhotspot/net/monitor/TrafficRecorder.kt b/mobile/src/main/java/be/mygod/vpnhotspot/net/monitor/TrafficRecorder.kt
index 809f7cc6..abfe5d0f 100644
--- a/mobile/src/main/java/be/mygod/vpnhotspot/net/monitor/TrafficRecorder.kt
+++ b/mobile/src/main/java/be/mygod/vpnhotspot/net/monitor/TrafficRecorder.kt
@@ -64,7 +64,13 @@ object TrafficRecorder {
 
     private fun doUpdate(timestamp: Long) {
         val oldRecords = LongSparseArray<TrafficRecord>()
-        loop@ for (line in RootSession.use { it.execOutUnjoinedWithWait("$IPTABLES -nvx -L vpnhotspot_fwd").drop(2) }) {
+        loop@ for (line in RootSession.use {
+            val command = "$IPTABLES -nvx -L vpnhotspot_fwd"
+            val result = it.execQuiet(command)
+            val message = it.checkOutput(command, result, false, false)
+            if (result.err.isNotEmpty()) Timber.i(message)
+            result.out.drop(2)
+        }) {
             val columns = line.split("\\s+".toRegex()).filter { it.isNotEmpty() }
             try {
                 check(columns.size >= 9)
diff --git a/mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/P2pSupplicantConfiguration.kt b/mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/P2pSupplicantConfiguration.kt
index a675e467..5c66f88b 100644
--- a/mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/P2pSupplicantConfiguration.kt
+++ b/mobile/src/main/java/be/mygod/vpnhotspot/net/wifi/P2pSupplicantConfiguration.kt
@@ -15,11 +15,11 @@ import java.io.File
 class P2pSupplicantConfiguration(private val group: WifiP2pGroup, ownerAddress: String?) {
     companion object {
         private const val TAG = "P2pSupplicantConfiguration"
+        private const val CONF_PATH_TREBLE = "/data/vendor/wifi/wpa/p2p_supplicant.conf"
+        private const val CONF_PATH_LEGACY = "/data/misc/wifi/p2p_supplicant.conf"
         private val networkParser =
                 "^(bssid=(([0-9a-fA-F]{2}:){5}[0-9a-fA-F]{2})|psk=(ext:|\"(.*)\"|[0-9a-fA-F]{64}\$))".toRegex()
         private val whitespaceMatcher = "\\s+".toRegex()
-        private val confPath = if (Build.VERSION.SDK_INT >= 28)
-            "/data/vendor/wifi/wpa/p2p_supplicant.conf" else "/data/misc/wifi/p2p_supplicant.conf"
     }
 
     private class NetworkBlock : ArrayList<String>() {
@@ -46,7 +46,10 @@ class P2pSupplicantConfiguration(private val group: WifiP2pGroup, ownerAddress:
         RootSession.use {
             val result = ArrayList<Any>()
             var target: NetworkBlock? = null
-            val parser = Parser(it.execOutUnjoined("cat $confPath"))
+            val command = "cat $CONF_PATH_TREBLE || cat $CONF_PATH_LEGACY"
+            val shell = it.execQuiet(command)
+            it.checkOutput(command, shell, false, false)
+            val parser = Parser(shell.out)
             try {
                 while (parser.next()) {
                     if (parser.trimmed.startsWith("network={")) {
@@ -77,7 +80,7 @@ class P2pSupplicantConfiguration(private val group: WifiP2pGroup, ownerAddress:
                         }
                     } else result.add(parser.line)
                 }
-                Pair(result, target!!)
+                Triple(result, target!!, shell.err.isNotEmpty())
             } catch (e: RuntimeException) {
                 DebugHelper.setString(TAG, parser.lines.joinToString("\n"))
                 DebugHelper.setString("$TAG.ownerAddress", ownerAddress)
@@ -89,7 +92,7 @@ class P2pSupplicantConfiguration(private val group: WifiP2pGroup, ownerAddress:
     val psk = group.passphrase ?: content.second.psk!!
 
     fun update(ssid: String, psk: String) {
-        val (lines, block) = content
+        val (lines, block, legacy) = content
         block[block.ssidLine!!] = "\tssid=" + ssid.toByteArray()
                 .joinToString("") { (it.toInt() and 255).toString(16).padStart(2, '0') }
         block[block.pskLine!!] = "\tpsk=\"$psk\""   // no control chars or weird stuff
@@ -100,7 +103,7 @@ class P2pSupplicantConfiguration(private val group: WifiP2pGroup, ownerAddress:
             }
             // pkill not available on Lollipop. Source: https://android.googlesource.com/platform/system/core/+/master/shell_and_utilities/README.md
             RootSession.use {
-                it.exec("cat ${tempFile.absolutePath} > $confPath")
+                it.exec("cat ${tempFile.absolutePath} > ${if (legacy) CONF_PATH_LEGACY else CONF_PATH_TREBLE}")
                 if (Build.VERSION.SDK_INT >= 23) it.exec("pkill wpa_supplicant") else {
                     val result = it.execOut("ps | grep wpa_supplicant").split(whitespaceMatcher)
                     check(result.size >= 2) { "wpa_supplicant not found, please toggle Airplane mode manually" }
diff --git a/mobile/src/main/java/be/mygod/vpnhotspot/util/RootSession.kt b/mobile/src/main/java/be/mygod/vpnhotspot/util/RootSession.kt
index cd466c6f..d53dbec5 100644
--- a/mobile/src/main/java/be/mygod/vpnhotspot/util/RootSession.kt
+++ b/mobile/src/main/java/be/mygod/vpnhotspot/util/RootSession.kt
@@ -57,8 +57,8 @@ class RootSession : AutoCloseable {
     }
 
     class UnexpectedOutputException(msg: String) : RuntimeException(msg)
-    private fun checkOutput(command: String, result: Shell.Result, out: Boolean = result.out.isNotEmpty(),
-                            err: Boolean = result.err.isNotEmpty()): String {
+    fun checkOutput(command: String, result: Shell.Result, out: Boolean = result.out.isNotEmpty(),
+                    err: Boolean = result.err.isNotEmpty()): String {
         val msg = StringBuilder("$command exited with ${result.code}")
         if (out) result.out.forEach { msg.append("\n$it") }
         if (err) result.err.forEach { msg.append("\nE $it") }
@@ -101,22 +101,11 @@ class RootSession : AutoCloseable {
         }).exec()
     }
     fun exec(command: String) = checkOutput(command, execQuiet(command))
-    fun execWithWait(command: String) {
-        val result = execQuiet(command)
-        val message = checkOutput(command, result, err = false)
-        if (result.err.isNotEmpty()) Timber.i(message)
-    }
     fun execOutUnjoined(command: String): List<String> {
         val result = execQuiet(command)
         checkOutput(command, result, false)
         return result.out
     }
-    fun execOutUnjoinedWithWait(command: String): List<String> {
-        val result = execQuiet(command)
-        val message = checkOutput(command, result, false, false)
-        if (result.err.isNotEmpty()) Timber.i(message)
-        return result.out
-    }
     fun execOut(command: String): String = execOutUnjoined(command).joinToString("\n")
 
     /**
@@ -127,7 +116,11 @@ class RootSession : AutoCloseable {
 
         fun exec(command: String, revert: String? = null, wait: Boolean = false) {
             if (revert != null) revertCommands.addFirst(revert) // add first just in case exec fails
-            if (wait) this@RootSession.execWithWait(command) else this@RootSession.exec(command)
+            if (wait) {
+                val result = this@RootSession.execQuiet(command)
+                val message = checkOutput(command, result, err = false)
+                if (result.err.isNotEmpty()) Timber.i(message)
+            } else this@RootSession.exec(command)
         }
         fun execQuiet(command: String) = this@RootSession.execQuiet(command)