diff --git a/manager/app/src/main/java/io/sukisu/ultra/UltraShellHelper.java b/manager/app/src/main/java/io/sukisu/ultra/UltraShellHelper.java
index 6d0a7bd7..643a382d 100644
--- a/manager/app/src/main/java/io/sukisu/ultra/UltraShellHelper.java
+++ b/manager/app/src/main/java/io/sukisu/ultra/UltraShellHelper.java
@@ -19,10 +19,12 @@ public class UltraShellHelper {
     }
 
     public static boolean isPathExists(String path) {
-        return runCmd("file " + path).contains("No such file or directory");
+        String result = runCmd("test -f '" + path + "' && echo 'exists'");
+        return result.contains("exists");
     }
 
-    public static void CopyFileTo(String path, String target) {
-        runCmd("cp -f " + path + " " + target);
+    public static boolean CopyFileTo(String path, String target) {
+        String result = runCmd("cp -f '" + path + "' '" + target + "' 2>&1");
+        return !result.contains("cp: ");
     }
 }
diff --git a/manager/app/src/main/java/zako/zako/zako/zakoui/activity/component/BottomBar.kt b/manager/app/src/main/java/zako/zako/zako/zakoui/activity/component/BottomBar.kt
index c0217eed..12debc22 100644
--- a/manager/app/src/main/java/zako/zako/zako/zakoui/activity/component/BottomBar.kt
+++ b/manager/app/src/main/java/zako/zako/zako/zakoui/activity/component/BottomBar.kt
@@ -59,7 +59,7 @@ fun BottomBar(navController: NavHostController) {
     ) {
         BottomBarDestination.entries.forEach { destination ->
             if (destination == BottomBarDestination.Kpm) {
-                if (kpmVersion.isNotEmpty() && !kpmVersion.startsWith("Error") && !showKpmInfo && Natives.version >= Natives.MINIMAL_SUPPORTED_KPM) {
+                if (kpmVersion.isNotEmpty() && !showKpmInfo && Natives.version >= Natives.MINIMAL_SUPPORTED_KPM) {
                     if (!isFullFeatured && destination.rootRequired) return@forEach
                     val isCurrentDestOnBackStack by navController.isRouteOnBackStackAsState(destination.direction)
                     NavigationBarItem(
diff --git a/manager/app/src/main/java/zako/zako/zako/zakoui/activity/util/AppData.kt b/manager/app/src/main/java/zako/zako/zako/zakoui/activity/util/AppData.kt
index 1ec67f81..3c498a1b 100644
--- a/manager/app/src/main/java/zako/zako/zako/zakoui/activity/util/AppData.kt
+++ b/manager/app/src/main/java/zako/zako/zako/zakoui/activity/util/AppData.kt
@@ -88,7 +88,7 @@ object AppData {
             val version = getKpmVersion()
             if (version.isEmpty()) "" else version
         } catch (e: Exception) {
-            "Error: ${e.message}"
+            ""
         }
     }
 
diff --git a/manager/app/src/main/java/zako/zako/zako/zakoui/flash/KernelFlash.kt b/manager/app/src/main/java/zako/zako/zako/zakoui/flash/KernelFlash.kt
index b71b0ef1..8ed0838b 100644
--- a/manager/app/src/main/java/zako/zako/zako/zakoui/flash/KernelFlash.kt
+++ b/manager/app/src/main/java/zako/zako/zako/zakoui/flash/KernelFlash.kt
@@ -287,16 +287,10 @@ class HorizonKernelWorker(
     }
 
     private fun runCommand(su: Boolean, cmd: String): Int {
-        val process = ProcessBuilder(if (su) "su" else "sh")
-            .redirectErrorStream(true)
-            .start()
+        val shell = if (su) "su" else "sh"
+        val process = Runtime.getRuntime().exec(arrayOf(shell, "-c", cmd))
 
         return try {
-            process.outputStream.bufferedWriter().use { writer ->
-                writer.write("$cmd\n")
-                writer.write("exit\n")
-                writer.flush()
-            }
             process.waitFor()
         } finally {
             process.destroy()
@@ -304,16 +298,10 @@ class HorizonKernelWorker(
     }
 
     private fun runCommandGetOutput(su: Boolean, cmd: String): String? {
-        val process = ProcessBuilder(if (su) "su" else "sh")
-            .redirectErrorStream(true)
-            .start()
+        val shell = if (su) "su" else "sh"
+        val process = Runtime.getRuntime().exec(arrayOf(shell, "-c", cmd))
 
         return try {
-            process.outputStream.bufferedWriter().use { writer ->
-                writer.write("$cmd\n")
-                writer.write("exit\n")
-                writer.flush()
-            }
             process.inputStream.bufferedReader().use { reader ->
                 reader.readText().trim()
             }
@@ -326,7 +314,7 @@ class HorizonKernelWorker(
 
     private fun rootAvailable(): Boolean {
         return try {
-            val process = Runtime.getRuntime().exec("su -c id")
+            val process = Runtime.getRuntime().exec("su -c true")
             val exitValue = process.waitFor()
             exitValue == 0
         } catch (_: Exception) {