diff --git a/Makefile b/Makefile
index 77a4c516a..fe4eb7008 100644
--- a/Makefile
+++ b/Makefile
@@ -128,8 +128,9 @@ koboupdate: all
 androidupdate: all
 	mkdir -p $(ANDROID_LAUNCHER_DIR)/assets/module
 	-rm $(ANDROID_LAUNCHER_DIR)/assets/module/koreader-*
-	cd $(INSTALL_DIR)/koreader && 7z a -l -mx=3 \
-		../../$(ANDROID_LAUNCHER_DIR)/assets/module/koreader-g$(REVISION).7z *
+	cd $(INSTALL_DIR)/koreader && 7z a -l -mx=1 \
+		../../$(ANDROID_LAUNCHER_DIR)/assets/module/koreader-g$(REVISION).7z * \
+		-x!resources/fonts -x!resources/icons/src -x!spec
 
 androiddev: androidupdate
 	$(MAKE) -C $(ANDROID_LAUNCHER_DIR) dev
diff --git a/android/luajit-launcher b/android/luajit-launcher
index 675fce576..3153b9269 160000
--- a/android/luajit-launcher
+++ b/android/luajit-launcher
@@ -1 +1 @@
-Subproject commit 675fce5766d4b9390399f454959d12e2e545b14e
+Subproject commit 3153b92693a4a57cbe6e21d32f94b1f89e115633
diff --git a/frontend/document/koptinterface.lua b/frontend/document/koptinterface.lua
index 01229ad56..67ef58f5b 100644
--- a/frontend/document/koptinterface.lua
+++ b/frontend/document/koptinterface.lua
@@ -7,6 +7,7 @@ local Geom = require("ui/geometry")
 local serial = require("serialize")
 local Cache = require("cache")
 local DEBUG = require("dbg")
+local util = require("ffi/util")
 
 local KoptInterface = {
     ocrengine = "ocrengine",
@@ -673,7 +674,20 @@ end
 
 function KoptInterface:clipPagePNGString(doc, pos0, pos1, pboxes, drawer)
     local kc = self:getClipPageContext(doc, pos0, pos1, pboxes, drawer)
-    local png = kc:exportSrcPNGString(pboxes, drawer)
+    -- there is no fmemopen in Android so leptonica.pixWriteMemPng will
+    -- fail silently, workaround is creating a PNG file and read back the string
+    local png = nil
+    if util.isAndroid() then
+        local tmp = "cache/tmpclippng.png"
+        kc:exportSrcPNGFile(pboxes, drawer, tmp)
+        local pngfile = io.open(tmp, "rb")
+        if pngfile then
+            png = pngfile:read("*all")
+            pngfile:close()
+        end
+    else
+        png = kc:exportSrcPNGString(pboxes, drawer)
+    end
     kc:free()
     return png
 end
diff --git a/frontend/ui/widget/buttondialog.lua b/frontend/ui/widget/buttondialog.lua
index ad4794acd..58aa18e88 100644
--- a/frontend/ui/widget/buttondialog.lua
+++ b/frontend/ui/widget/buttondialog.lua
@@ -21,7 +21,8 @@ function ButtonDialog:init()
             AnyKeyPressed = { { Input.group.Any },
                 seqtext = "any key", doc = _("close dialog") }
         }
-    else
+    end
+    if Device:isTouchDevice() then
         self.ges_events.TapClose = {
             GestureRange:new{
                 ges = "tap",
diff --git a/frontend/ui/widget/virtualkeyboard.lua b/frontend/ui/widget/virtualkeyboard.lua
index 1836d2e9e..ea1e1b2d6 100644
--- a/frontend/ui/widget/virtualkeyboard.lua
+++ b/frontend/ui/widget/virtualkeyboard.lua
@@ -20,10 +20,10 @@ local VirtualKey = InputContainer:new{
     key = nil,
     icon = nil,
     label = nil,
-    
+
     keyboard = nil,
     callback = nil,
-    
+
     width = nil,
     height = nil,
     bordersize = 2,
@@ -42,7 +42,7 @@ function VirtualKey:init()
     else
         self.callback = function () self.keyboard:addChar(self.key) end
     end
-    
+
     local label_widget = nil
     if self.icon then
         label_widget = ImageWidget:new{
@@ -96,10 +96,6 @@ end
 
 function VirtualKey:invert(invert)
     self[1].invert = invert
-    UIManager.update_region_func = function()
-        DEBUG("update key region", self[1].dimen)
-        return self[1].dimen
-    end
     UIManager:setDirty(self.keyboard, "partial")
 end
 
@@ -114,7 +110,7 @@ local VirtualKeyboard = InputContainer:new{
     shiftmode = false,
     symbolmode = false,
     utf8mode = false,
-    
+
     width = 600,
     height = 256,
     bordersize = 2,
@@ -183,7 +179,7 @@ function VirtualKeyboard:init()
               icon = "resources/icons/appbar.arrow.enter.png",
               width = 1.5,
             },
-            
+
         }
     }
     self:initLayout(self.layout)
@@ -196,7 +192,7 @@ function VirtualKeyboard:initLayout(layout)
         end
         return 2 - boolnum(b1) + 2 * boolnum(b2) + 4 * boolnum(b3)
     end
-    
+
     if layout then
         -- to be sure layout is selected properly
         layout = math.max(layout, self.min_layout)
@@ -223,7 +219,7 @@ function VirtualKeyboard:addKeys()
         local horizontal_group = HorizontalGroup:new{}
         for j = 1, #self.KEYS[i] do
             local width_factor = self.KEYS[i][j].width or 1.0
-            local key_width = math.floor((base_key_width + self.key_padding) * width_factor) 
+            local key_width = math.floor((base_key_width + self.key_padding) * width_factor)
                             - self.key_padding
             local key_height = base_key_height
             local label = self.KEYS[i][j].label or self.KEYS[i][j][self.layout]
@@ -236,7 +232,7 @@ function VirtualKeyboard:addKeys()
                 height = key_height,
             }
             table.insert(horizontal_group, key)
-            if j ~= #self.KEYS[i] then 
+            if j ~= #self.KEYS[i] then
                 table.insert(horizontal_group, h_key_padding)
             end
         end
@@ -245,7 +241,7 @@ function VirtualKeyboard:addKeys()
             table.insert(vertical_group, v_key_padding)
         end
     end
-    
+
     local size = vertical_group:getSize()
     local keyboard_frame = FrameContainer:new{
         margin = 0,
diff --git a/koreader-base b/koreader-base
index 34a26b30c..88e83badb 160000
--- a/koreader-base
+++ b/koreader-base
@@ -1 +1 @@
-Subproject commit 34a26b30c2fb85f4520c07a8b4cd3ead51297f18
+Subproject commit 88e83badbc4d0a06a99d53ea5003c3e19f539f9d