diff --git a/manager/app/src/main/java/com/rifsxd/ksunext/ui/screen/Module.kt b/manager/app/src/main/java/com/rifsxd/ksunext/ui/screen/Module.kt
index d5f5b81d..f9e56623 100644
--- a/manager/app/src/main/java/com/rifsxd/ksunext/ui/screen/Module.kt
+++ b/manager/app/src/main/java/com/rifsxd/ksunext/ui/screen/Module.kt
@@ -1089,6 +1089,7 @@ fun ModuleItem(
 }
 
 fun formatSize(size: Long): String {
+    if (size == 0L) return "null"
     val kb = 1024
     val mb = kb * 1024
     val gb = mb * 1024
diff --git a/manager/app/src/main/java/com/rifsxd/ksunext/ui/util/KsuCli.kt b/manager/app/src/main/java/com/rifsxd/ksunext/ui/util/KsuCli.kt
index 1e4919d0..10a9dc26 100644
--- a/manager/app/src/main/java/com/rifsxd/ksunext/ui/util/KsuCli.kt
+++ b/manager/app/src/main/java/com/rifsxd/ksunext/ui/util/KsuCli.kt
@@ -28,6 +28,7 @@ import java.io.File
  * @date 2023/1/1.
  */
 private const val TAG = "KsuCli"
+private const val BUSYBOX = "/data/adb/ksu/bin/busybox"
 
 private fun ksuDaemonMagicPath(): String {
     return ksuApp.applicationInfo.nativeLibraryDir + File.separator + "libksud_magic.so"
@@ -490,7 +491,7 @@ fun moduleBackup(): Boolean {
     val internalBackupDir = "/sdcard/.ksunext/modules"
     val internalBackupPath = "$internalBackupDir/$tarName"
 
-    val tarCmd = "tar -cpf $tarPath -C /data/adb/modules $(ls /data/adb/modules)"
+    val tarCmd = "$BUSYBOX tar -cpf $tarPath -C /data/adb/modules $(ls /data/adb/modules)"
     val tarResult = ShellUtils.fastCmd(shell, tarCmd).trim()
     if (tarResult.isNotEmpty()) return false
 
@@ -511,7 +512,7 @@ fun moduleRestore(): Boolean {
     val tarPath = ShellUtils.fastCmd(shell, findTarCmd).trim()
     if (tarPath.isEmpty()) return false
 
-    val extractCmd = "tar -xpf $tarPath -C /data/adb/modules_update"
+    val extractCmd = "$BUSYBOX tar -xpf $tarPath -C /data/adb/modules_update"
     val extractResult = ShellUtils.fastCmd(shell, extractCmd).trim()
     return extractResult.isEmpty()
 }
@@ -533,7 +534,7 @@ fun allowlistBackup(): Boolean {
     val internalBackupDir = "/sdcard/.ksunext/allowlist"
     val internalBackupPath = "$internalBackupDir/$tarName"
 
-    val tarCmd = "tar -cpf $tarPath -C /data/adb/ksu .allowlist"
+    val tarCmd = "$BUSYBOX tar -cpf $tarPath -C /data/adb/ksu .allowlist"
     val tarResult = ShellUtils.fastCmd(shell, tarCmd).trim()
     if (tarResult.isNotEmpty()) return false
 
@@ -556,7 +557,7 @@ fun allowlistRestore(): Boolean {
     if (tarPath.isEmpty()) return false
 
     // Extract the tar to /data/adb/ksu (restores .allowlist folder with permissions)
-    val extractCmd = "tar -xpf $tarPath -C /data/adb/ksu"
+    val extractCmd = "$BUSYBOX tar -xpf $tarPath -C /data/adb/ksu"
     val extractResult = ShellUtils.fastCmd(shell, extractCmd).trim()
     return extractResult.isEmpty()
 }
@@ -623,7 +624,7 @@ fun currentMountSystem(): String {
 
 fun getModuleSize(dir: File): Long {
     val shell = getRootShell()
-    val cmd = "du -sb '${dir.absolutePath}' | awk '{print \$1}'"
+    val cmd = "$BUSYBOX du -sb '${dir.absolutePath}' | awk '{print \$1}'"
     val result = ShellUtils.fastCmd(shell, cmd).trim()
     return result.toLongOrNull() ?: 0L
 }