diff --git a/frontend/apps/filemanager/filemanagermenu.lua b/frontend/apps/filemanager/filemanagermenu.lua
index f6e881541..b2c5adc17 100644
--- a/frontend/apps/filemanager/filemanagermenu.lua
+++ b/frontend/apps/filemanager/filemanagermenu.lua
@@ -138,26 +138,7 @@ function FileManagerMenu:setUpdateItemTable()
     table.insert(self.tab_item_table.setting, Language:getLangMenuTable())
 
     -- info tab
-    table.insert(self.tab_item_table.info, {
-        text = _("Check update"),
-        callback = function()
-            local ota_version = OTAManager:checkUpdate()
-            if ota_version == 0 then
-                UIManager:show(InfoMessage:new{
-                    text = _("Your koreader is updated."),
-                })
-            elseif ota_version == nil then
-                UIManager:show(InfoMessage:new{
-                    text = _("OTA server is not available."),
-                })
-            elseif ota_version then
-                UIManager:show(ConfirmBox:new{
-                    text = _("Do you want to update to version ")..ota_version.."?",
-                    ok_callback = function() OTAManager:zsync() end
-                })
-            end
-        end
-    })
+    table.insert(self.tab_item_table.info, OTAManager:genMenuEntry())
     table.insert(self.tab_item_table.info, {
         text = _("Version"),
         callback = function()
diff --git a/frontend/apps/reader/modules/readermenu.lua b/frontend/apps/reader/modules/readermenu.lua
index f0e3a1dcd..c5e571808 100644
--- a/frontend/apps/reader/modules/readermenu.lua
+++ b/frontend/apps/reader/modules/readermenu.lua
@@ -138,26 +138,7 @@ function ReaderMenu:setUpdateItemTable()
     table.insert(self.tab_item_table.setting, Language:getLangMenuTable())
 
     -- info tab
-    table.insert(self.tab_item_table.info, {
-        text = _("Check update"),
-        callback = function()
-            local ota_version = OTAManager:checkUpdate()
-            if ota_version == 0 then
-                UIManager:show(InfoMessage:new{
-                    text = _("Your koreader is updated."),
-                })
-            elseif ota_version == nil then
-                UIManager:show(InfoMessage:new{
-                    text = _("OTA server is not available."),
-                })
-            elseif ota_version then
-                UIManager:show(ConfirmBox:new{
-                    text = _("Do you want to update to version ")..ota_version.."?",
-                    ok_callback = function() OTAManager:zsync() end
-                })
-            end
-        end
-    })
+    table.insert(self.tab_item_table.info, OTAManager:genMenuEntry())
     table.insert(self.tab_item_table.info, {
         text = _("Version"),
         callback = function()
diff --git a/frontend/ui/otamanager.lua b/frontend/ui/otamanager.lua
index c49edce50..10a48769e 100644
--- a/frontend/ui/otamanager.lua
+++ b/frontend/ui/otamanager.lua
@@ -1,5 +1,9 @@
+local InfoMessage = require("ui/widget/infomessage")
+local ConfirmBox = require("ui/widget/confirmbox")
+local UIManager = require("ui/uimanager")
 local Device = require("ui/device")
 local DEBUG = require("dbg")
+local _ = require("gettext")
 
 local OTAManager = {
     ota_server = "http://vislab.bjmu.edu.cn/apps/koreader/ota/",
@@ -78,11 +82,46 @@ end
 function OTAManager:zsync()
     if self:_buildLocalPackage() == 0 then
         return os.execute(string.format(
-        "./zsync -i %s -o %s -u %s %s &",
+        "./zsync -i %s -o %s -u %s %s",
         self.installed_package, self.updated_package,
         self.ota_server, "ota/" .. self:getZsyncFilename()
         ))
     end
 end
 
+function OTAManager:genMenuEntry()
+    return {
+        text = _("Check update"),
+        callback = function()
+            local ota_version = OTAManager:checkUpdate()
+            if ota_version == 0 then
+                UIManager:show(InfoMessage:new{
+                    text = _("Your koreader is updated."),
+                })
+            elseif ota_version == nil then
+                UIManager:show(InfoMessage:new{
+                    text = _("OTA server is not available."),
+                })
+            elseif ota_version then
+                UIManager:show(ConfirmBox:new{
+                    text = _("Do you want to update to version ")..ota_version.."?",
+                    ok_callback = function()
+                        UIManager:show(InfoMessage:new{
+                            text = _("Downloading may take several minutes..."),
+                            timeout = 3,
+                        })
+                        UIManager:scheduleIn(1, function()
+                            if OTAManager:zsync() == 0 then
+                                UIManager:show(InfoMessage:new{
+                                    text = _("Koreader will be updated on next restart."),
+                                })
+                            end
+                        end)
+                    end
+                })
+            end
+        end
+    }
+end
+
 return OTAManager
diff --git a/koreader-base b/koreader-base
index 9d54e91f8..7bd19dfee 160000
--- a/koreader-base
+++ b/koreader-base
@@ -1 +1 @@
-Subproject commit 9d54e91f82090ad8d2a5f00f9db94b38c0afa4b7
+Subproject commit 7bd19dfee79f608911224c8195a08fb33c594d54