diff --git a/functions.h b/functions.h
index 05410d9..264a640 100644
--- a/functions.h
+++ b/functions.h
@@ -106,6 +106,9 @@ namespace {
         config.close();
         return 0;
     };
+    void setDefaultWorkDir() {
+        QDir::setCurrent("/mnt/onboard/.adds/inkbox");
+    }
     int brightness_checkconfig(QString file) {
         QFile config(file);
         config.open(QIODevice::ReadWrite);
@@ -306,8 +309,16 @@ namespace {
 
         kernelVersion = proc->readAllStandardOutput();
         kernelVersion = kernelVersion.trimmed();
-        string_writeconfig("get_kernel_build_id", "/external_root/run/initrd-fifo");
+
+        setDefaultWorkDir();
+        QString fifo_prog("sh");
+        QStringList fifo_args;
+        fifo_args << "get_kernel_build_id.sh";
+        QProcess *fifo_proc = new QProcess();
+        fifo_proc->start(fifo_prog, fifo_args);
+        fifo_proc->waitForFinished();
         QThread::msleep(100);
+
         string_checkconfig_ro("/external_root/run/build_id");
         QString kernelBuildID = checkconfig_str_val.trimmed();
         kernelVersion.append(", build ");
@@ -333,9 +344,6 @@ namespace {
         global::kobox::resetKoboxUserDataBool = true;
         reboot(true);
     }
-    void setDefaultWorkDir() {
-        QDir::setCurrent("/mnt/onboard/.adds/inkbox");
-    }
     QString findEpubMetadata(QString book_file, QString metadata) {
         setDefaultWorkDir();
         QString prog ("sh");
diff --git a/koboxappsdialog.cpp b/koboxappsdialog.cpp
index 6fdc120..1cfc1f1 100644
--- a/koboxappsdialog.cpp
+++ b/koboxappsdialog.cpp
@@ -97,7 +97,17 @@ void koboxAppsDialog::on_launchBtn_clicked()
         // DPI setting
         string_checkconfig(".config/00-kobox/dpiSetting");
         if(checkconfig_str_val == "") {
-            dpiSetting = "125";
+            string_checkconfig_ro("/opt/inkbox_device\n");
+            if(checkconfig_str_val == "n705\n" or checkconfig_str_val == "n905\n") {
+                dpiSetting = "125";
+            }
+            else if(checkconfig_str_val == "n613\n") {
+                dpiSetting = "175";
+            }
+            else {
+                dpiSetting = "125";
+            }
+
         }
         else {
             dpiSetting = checkconfig_str_val.toStdString();
@@ -114,7 +124,15 @@ void koboxAppsDialog::on_launchBtn_clicked()
         else if(itemText == "KTerm") {
             string_writeconfig("/external_root/tmp/X_program", "/usr/local/bin/kterm -l /usr/local/share/kterm/layouts/keyboard-kt.xml -k 1");
             dpModeSetting = "fullscreen";
-            dpiSetting = "175";
+            string_checkconfig_ro("/opt/inkbox_device");
+            if(checkconfig_str_val == "n705\n" or checkconfig_str_val == "n905\n") {
+                dpiSetting = "175";
+            }
+            else if(checkconfig_str_val == "n613\n")
+                dpiSetting = "225";
+            else {
+                dpiSetting = "175";
+            }
         }
         else if(itemText == "Geany") {
             string_writeconfig("/external_root/tmp/X_program", "geany");
diff --git a/reader.cpp b/reader.cpp
index 4f00301..dbb9077 100644
--- a/reader.cpp
+++ b/reader.cpp
@@ -832,6 +832,9 @@ void reader::on_brightnessDecBtn_clicked()
         ;
     }
     int set_bval = bval - 1;
+    if(set_bval < 0) {
+        set_bval = 0;
+    }
     pre_set_brightness(set_bval);
     brightness_writeconfig(set_bval);
 
@@ -853,6 +856,9 @@ void reader::on_brightnessIncBtn_clicked()
         ;
     }
     int set_bval = bval + 1;
+    if(set_bval > 100) {
+        set_bval = 100;
+    }
     pre_set_brightness(set_bval);
     brightness_writeconfig(set_bval);
 
diff --git a/settingschooser.cpp b/settingschooser.cpp
index f4f508a..ee47b31 100644
--- a/settingschooser.cpp
+++ b/settingschooser.cpp
@@ -46,6 +46,10 @@ settingsChooser::settingsChooser(QWidget *parent) :
         ui->inkboxSettingsBtn->setStyleSheet("padding: 20px; Text-align: left");
         ui->koboxSettingsBtn->setStyleSheet("padding: 20px; Text-align: left");
     }
+    else if(checkconfig_str_val == "n613\n") {
+        ui->inkboxSettingsBtn->setStyleSheet("padding: 25px; Text-align: left");
+        ui->koboxSettingsBtn->setStyleSheet("padding:25px; Text-align: left");
+    }
     else {
         ui->inkboxSettingsBtn->setStyleSheet("padding: 40px; Text-align: left");
         ui->koboxSettingsBtn->setStyleSheet("padding: 40px; Text-align: left");