diff --git a/frontend/httpclient.lua b/frontend/httpclient.lua
index fb2668435..0ee112b1e 100644
--- a/frontend/httpclient.lua
+++ b/frontend/httpclient.lua
@@ -17,7 +17,7 @@ function HTTPClient:request(request, response_callback)
     request.connect_timeout = 10
     request.request_timeout = 20
     UIManager:initLooper()
-    UIManager:handleTask(function()
+    UIManager.looper:add_callback(function()
         -- avoid endless waiting for input
         UIManager.INPUT_TIMEOUT = self.INPUT_TIMEOUT
         self.input_timeouts = self.input_timeouts + 1
diff --git a/frontend/ui/uimanager.lua b/frontend/ui/uimanager.lua
index 44c42845f..880491d13 100644
--- a/frontend/ui/uimanager.lua
+++ b/frontend/ui/uimanager.lua
@@ -498,24 +498,14 @@ function UIManager:handleInput()
         end
     end
 
-    -- handle next input
-    self:handleTask(function() self:handleInput() end)
-end
-
--- handle task(callback function) in Turbo I/O looper
--- or run task immediately if looper is not available
-function UIManager:handleTask(task)
     if self.looper then
-        DEBUG("handle task in turbo I/O looper")
-        self.looper:add_callback(task)
-    else
-        DEBUG("run task")
-        task()
+        DEBUG("handle input in turbo I/O looper")
+        self.looper:add_callback(function() self:handleInput() end)
     end
 end
 
 function UIManager:initLooper()
-    if not self.looper then
+    if not self.looper and not Device.isAndroid() and ffi.os ~= "Windows" then
         TURBO_SSL = true
         local turbo = require("turbo")
         self.looper = turbo.ioloop.instance()
@@ -527,11 +517,15 @@ end
 -- them to dialogs
 function UIManager:run()
     self._running = true
-    if ffi.os == "Windows" then
-        self:handleInput()
+    self:initLooper()
+    -- currently there is no Turbo support for Android and Windows
+    -- use our own main loop
+    if not self.looper then
+        while self._running do
+            self:handleInput()
+        end
     else
-        self:initLooper()
-        self:handleTask(function() self:handleInput() end)
+        self.looper:add_callback(function() self:handleInput() end)
         self.looper:start()
     end
 end
diff --git a/plugins/kosync.koplugin/KOSyncClient.lua b/plugins/kosync.koplugin/KOSyncClient.lua
index 98ca2a2ab..b2b645e31 100644
--- a/plugins/kosync.koplugin/KOSyncClient.lua
+++ b/plugins/kosync.koplugin/KOSyncClient.lua
@@ -25,13 +25,13 @@ function KOSyncClient:init()
         req.headers['x-auth-user'] = args.username
         req.headers['x-auth-key'] = args.userkey
     end
-    local HTTPClient = require("httpclient")
-    local async_http_client = HTTPClient:new()
     package.loaded['Spore.Middleware.AsyncHTTP'] = {}
     require('Spore.Middleware.AsyncHTTP').call = function(args, req)
+        -- disable async http if Turbo looper is missing
+        if not UIManager.looper then return end
         req:finalize()
         local result
-        async_http_client:request({
+        require("httpclient"):new():request({
             url = req.url,
             method = req.method,
             body = req.env.spore.payload,
@@ -47,8 +47,6 @@ function KOSyncClient:init()
             -- Turbo HTTP client uses code instead of status
             -- change to status so that Spore can understand
             result.status = res.code
-            -- fallback to sync http request
-            if result.error then result = nil end
             coroutine.resume(args.thread)
         end)
         return coroutine.create(function() coroutine.yield(result) end)
@@ -119,7 +117,7 @@ function KOSyncClient:update_progress(username, password,
     end)
     self.client:enable("AsyncHTTP", {thread = co})
     coroutine.resume(co)
-    UIManager.INPUT_TIMEOUT = 100
+    if UIManager.looper then UIManager.INPUT_TIMEOUT = 100 end
 end
 
 function KOSyncClient:get_progress(username, password,
@@ -146,7 +144,7 @@ function KOSyncClient:get_progress(username, password,
     end)
     self.client:enable("AsyncHTTP", {thread = co})
     coroutine.resume(co)
-    UIManager.INPUT_TIMEOUT = 100
+    if UIManager.looper then UIManager.INPUT_TIMEOUT = 100 end
 end
 
 return KOSyncClient