diff --git a/src/calibre/devices/kobo/driver.py b/src/calibre/devices/kobo/driver.py
index 3e87f12255..835ab0219e 100644
--- a/src/calibre/devices/kobo/driver.py
+++ b/src/calibre/devices/kobo/driver.py
@@ -31,8 +31,6 @@ from calibre.utils.config_base import prefs
 EPUB_EXT  = '.epub'
 KEPUB_EXT = '.kepub'
 
-USE_SQLITE3 = False
-
 # Implementation of QtQHash for strings. This doesn't seem to be in the Python implementation.
 def qhash(inputstr):
     instr = b""
@@ -159,15 +157,8 @@ class KOBO(USBMS):
         return self.normalize_path(self._main_prefix + '.kobo/KoboReader.sqlite')
 
     def device_database_connection(self):
-        if USE_SQLITE3:
-            import sqlite3 as sqlite
-            db_connection = sqlite.connect(self.device_database_path())
-     
-            # return bytestrings if the content cannot the decoded as unicode
-            db_connection.text_factory = lambda x: unicode(x, "utf-8", "ignore")
-        else:
-            import apsw
-            db_connection = apsw.Connection(self.device_database_path())
+        import apsw
+        db_connection = apsw.Connection(self.device_database_path())
 
         return db_connection
 
@@ -1378,20 +1369,20 @@ class KOBOTOUCH(KOBO):
                           ' - N3_LIBRARY_FULL.parsed':[(355,473),0, 200,False,],   # Used for Details screen before FW2.8.1, then for current book tile on home screen
                           ' - N3_LIBRARY_GRID.parsed':[(149,198),0, 200,False,],   # Used for library lists
                           ' - N3_LIBRARY_LIST.parsed':[(60,90),0, 53,False,],
-                          ' - AndroidBookLoadTablet_Aspect.parsed':[(355,473), 82, 200,False,],   # Used for Details screen from FW2.8.1
+                          ' - AndroidBookLoadTablet_Aspect.parsed':[(355,473), 82, 100,False,],   # Used for Details screen from FW2.8.1
 #                          ' - N3_LIBRARY_SHELF.parsed': [(40,60),0, 52,],
                           }
     GLO_COVER_FILE_ENDINGS = {      # Glo and Aura share resolution, so the image sizes should be the same.
                           ' - N3_FULL.parsed':[(758,1024),0, 200,True,],           # Used for screensaver, home screen
                           ' - N3_LIBRARY_FULL.parsed':[(355,479),0, 200,False,],   # Used for Details screen before FW2.8.1, then for current book tile on home screen
                           ' - N3_LIBRARY_GRID.parsed':[(149,201),0, 200,False,],   # Used for library lists
-                          ' - AndroidBookLoadTablet_Aspect.parsed':[(355,479), 88, 200,False,],   # Used for Details screen from FW2.8.1
+                          ' - AndroidBookLoadTablet_Aspect.parsed':[(355,479), 88, 100,False,],   # Used for Details screen from FW2.8.1
                           }
     AURA_HD_COVER_FILE_ENDINGS = {
                           ' - N3_FULL.parsed':        [(1080,1440), 0, 200,True,],  # Used for screensaver, home screen
                           ' - N3_LIBRARY_FULL.parsed':[(355,  471), 0, 200,False,],  # Used for Details screen before FW2.8.1, then for current book tile on home screen
                           ' - N3_LIBRARY_GRID.parsed':[(149,  198), 0, 200,False,],  # Used for library lists
-                          ' - AndroidBookLoadTablet_Aspect.parsed':[(355,  471), 88, 200,False,],   # Used for Details screen from FW2.8.1
+                          ' - AndroidBookLoadTablet_Aspect.parsed':[(355,  471), 88, 100,False,],   # Used for Details screen from FW2.8.1
                           }
     # Following are the sizes used with pre2.1.4 firmware
 #    COVER_FILE_ENDINGS = {
@@ -1846,18 +1837,18 @@ class KOBOTOUCH(KOBO):
     def imagefilename_from_imageID(self, prefix, ImageID):
         show_debug = self.is_debugging_title(ImageID)
 
-        path = self.images_path(prefix, ImageID)
-#        path = self.normalize_path(path.replace('/', os.sep))
-
-        for ending, cover_options in self.cover_file_endings().items():
-            fpath = path + ending
-            if os.path.exists(fpath):
-                if show_debug:
-                    debug_print("KoboTouch:imagefilename_from_imageID - have cover image fpath=%s" % (fpath))
-                return fpath
-
-        if show_debug:
-            debug_print("KoboTouch:imagefilename_from_imageID - no cover image found - ImageID=%s" % (ImageID))
+        if len(ImageID) > 0:
+            path = self.images_path(prefix, ImageID)
+    
+            for ending in self.cover_file_endings().keys():
+                fpath = path + ending
+                if os.path.exists(fpath):
+                    if show_debug:
+                        debug_print("KoboTouch:imagefilename_from_imageID - have cover image fpath=%s" % (fpath))
+                    return fpath
+    
+            if show_debug:
+                debug_print("KoboTouch:imagefilename_from_imageID - no cover image found - ImageID=%s" % (ImageID))
         return None
 
     def get_extra_css(self):