diff --git a/Makefile b/Makefile
index 38f28736b..75064202d 100644
--- a/Makefile
+++ b/Makefile
@@ -292,6 +292,8 @@ utupdate: all
 androidupdate: all
 	mkdir -p $(ANDROID_LAUNCHER_DIR)/assets/module
 	-rm $(ANDROID_LAUNCHER_DIR)/assets/module/koreader-*
+	# in runtime luajit-launcher's libluajit.so will be loaded
+	-rm $(INSTALL_DIR)/koreader/libs/libluajit.so
 	# create zip package
 	cd $(INSTALL_DIR)/koreader && \
 		zip -9 -r \
diff --git a/frontend/device/android/device.lua b/frontend/device/android/device.lua
index a90bcff2c..9e1bd570c 100644
--- a/frontend/device/android/device.lua
+++ b/frontend/device/android/device.lua
@@ -13,7 +13,7 @@ local Device = Generic:new{
     isAndroid = yes,
     hasFrontlight = yes,
     firmware_rev = "none",
-    display_dpi = ffi.C.AConfiguration_getDensity(android.app.config),
+    display_dpi = android.lib.AConfiguration_getDensity(android.app.config),
 }
 
 function Device:init()
@@ -35,13 +35,13 @@ function Device:init()
     }
 
     -- check if we have a keyboard
-    if ffi.C.AConfiguration_getKeyboard(android.app.config)
+    if android.lib.AConfiguration_getKeyboard(android.app.config)
        == ffi.C.ACONFIGURATION_KEYBOARD_QWERTY
     then
         self.hasKeyboard = yes
     end
     -- check if we have a touchscreen
-    if ffi.C.AConfiguration_getTouchscreen(android.app.config)
+    if android.lib.AConfiguration_getTouchscreen(android.app.config)
        ~= ffi.C.ACONFIGURATION_TOUCHSCREEN_NOTOUCH
     then
         self.isTouchDevice = yes
diff --git a/frontend/device/android/powerd.lua b/frontend/device/android/powerd.lua
index cc26ecd27..fa5267bf5 100644
--- a/frontend/device/android/powerd.lua
+++ b/frontend/device/android/powerd.lua
@@ -7,11 +7,13 @@ local AndroidPowerD = BasePowerD:new{
 }
 
 function AndroidPowerD:frontlightIntensityHW()
-    return android.getScreenBrightness()
+    return math.floor(android.getScreenBrightness() / 255 * self.fl_max)
 end
 
 function AndroidPowerD:setIntensityHW(intensity)
-    android.setScreenBrightness(math.floor(255 * intensity / 25))
+    if self.fl_intensity ~= intensity then
+        android.setScreenBrightness(math.floor(255 * intensity / self.fl_max))
+    end
 end
 
 function AndroidPowerD:getCapacityHW()
diff --git a/frontend/device/generic/device.lua b/frontend/device/generic/device.lua
index 87b050bc8..d442c3b1a 100644
--- a/frontend/device/generic/device.lua
+++ b/frontend/device/generic/device.lua
@@ -166,6 +166,9 @@ function Device:initNetworkManager() end
 
 function Device:supportsScreensaver() return false end
 
+-- Device specific method to set datetime
+function Device:setDateTime(year, month, day, hour, min, sec) end
+
 -- Device specific method if any setting needs being saved
 function Device:saveSettings() end
 
diff --git a/frontend/gettext.lua b/frontend/gettext.lua
index c357ad416..5800ce321 100644
--- a/frontend/gettext.lua
+++ b/frontend/gettext.lua
@@ -106,9 +106,9 @@ end
 if isAndroid then
     local ffi = require("ffi")
     local buf = ffi.new("char[?]", 16)
-    ffi.C.AConfiguration_getLanguage(android.app.config, buf)
+    android.lib.AConfiguration_getLanguage(android.app.config, buf)
     local lang = ffi.string(buf)
-    ffi.C.AConfiguration_getCountry(android.app.config, buf)
+    android.lib.AConfiguration_getCountry(android.app.config, buf)
     local country = ffi.string(buf)
     if lang and country then
         GetText.changeLang(lang.."_"..country)
diff --git a/platform/android/llapp_main.lua b/platform/android/llapp_main.lua
index bbea29718..a84ec80c5 100644
--- a/platform/android/llapp_main.lua
+++ b/platform/android/llapp_main.lua
@@ -46,8 +46,9 @@ local function update()
 
 end
 
+-- (Disabled, since we hide navbar on start now no need for this hack)
 -- run koreader patch before koreader startup
-pcall(function() dofile("/sdcard/koreader/patch.lua") end)
+-- pcall(function() dofile("/sdcard/koreader/patch.lua") end)
 
 -- set proper permission for sdcv
 A.execute("chmod", "755", "./sdcv")
diff --git a/platform/android/luajit-launcher b/platform/android/luajit-launcher
index bcda26e00..19779beab 160000
--- a/platform/android/luajit-launcher
+++ b/platform/android/luajit-launcher
@@ -1 +1 @@
-Subproject commit bcda26e0092400959388d5ee2be534773defda71
+Subproject commit 19779beabfbd6f8195efcaa998a739f39742c71e