diff --git a/src/eynollah/eynollah.py b/src/eynollah/eynollah.py
index 6356198..4d1644d 100644
--- a/src/eynollah/eynollah.py
+++ b/src/eynollah/eynollah.py
@@ -12,7 +12,7 @@ from difflib import SequenceMatcher as sq
 import math
 import os
 import time
-from typing import Dict, Type,  Union,List, Optional, Tuple
+from typing import List, Optional, Tuple
 import warnings
 from functools import partial
 from pathlib import Path
diff --git a/src/eynollah/mb_ro_on_layout.py b/src/eynollah/mb_ro_on_layout.py
index 0a8a7ae..8338d35 100644
--- a/src/eynollah/mb_ro_on_layout.py
+++ b/src/eynollah/mb_ro_on_layout.py
@@ -10,12 +10,13 @@ from pathlib import Path
 import xml.etree.ElementTree as ET
 
 import cv2
+from keras.models import Model
 import numpy as np
 from ocrd_utils import getLogger
 import statistics
 import tensorflow as tf
-from tensorflow.keras.models import load_model
 
+from .model_zoo import EynollahModelZoo
 from .utils.resize import resize_image
 from .utils.contour import (
     find_new_features_of_contours,
@@ -23,7 +24,6 @@ from .utils.contour import (
     return_parent_contours,
 )
 from .utils import is_xml_filename
-from .patch_encoder import PatchEncoder, Patches
 
 DPI_THRESHOLD = 298
 KERNEL = np.ones((5, 5), np.uint8)
@@ -45,21 +45,11 @@ class machine_based_reading_order_on_layout:
         except:
             self.logger.warning("no GPU device available")
             
-        self.model_reading_order = self.our_load_model(self.model_reading_order_dir)
+        self.model_zoo = EynollahModelZoo(basedir=dir_models)
+        self.model_zoo.load_model('reading_order')
+        # FIXME: light_version is always true, no need for checks in the code
         self.light_version = True
 
-    @staticmethod
-    def our_load_model(model_file):
-        if model_file.endswith('.h5') and Path(model_file[:-3]).exists():
-            # prefer SavedModel over HDF5 format if it exists
-            model_file = model_file[:-3]
-        try:
-            model = load_model(model_file, compile=False)
-        except:
-            model = load_model(model_file, compile=False, custom_objects={
-                "PatchEncoder": PatchEncoder, "Patches": Patches})
-        return model
-
     def read_xml(self, xml_file):
         tree1 = ET.parse(xml_file, parser = ET.XMLParser(encoding='utf-8'))
         root1=tree1.getroot()
@@ -69,6 +59,7 @@ class machine_based_reading_order_on_layout:
         index_tot_regions = []
         tot_region_ref = []
 
+        y_len, x_len = 0, 0
         for jj in root1.iter(link+'Page'):
             y_len=int(jj.attrib['imageHeight'])
             x_len=int(jj.attrib['imageWidth'])
@@ -81,13 +72,13 @@ class machine_based_reading_order_on_layout:
             co_printspace = []
             if link+'PrintSpace' in alltags:
                 region_tags_printspace = np.unique([x for x in alltags if x.endswith('PrintSpace')])
-            elif link+'Border' in alltags:
+            else:
                 region_tags_printspace = np.unique([x for x in alltags if x.endswith('Border')])
                 
             for tag in region_tags_printspace:
                 if link+'PrintSpace' in alltags:
                     tag_endings_printspace = ['}PrintSpace','}printspace']
-                elif link+'Border' in alltags:
+                else:
                     tag_endings_printspace = ['}Border','}border']
                     
                 if tag.endswith(tag_endings_printspace[0]) or tag.endswith(tag_endings_printspace[1]):
@@ -683,7 +674,7 @@ class machine_based_reading_order_on_layout:
                 tot_counter += 1
                 batch.append(j)
                 if tot_counter % inference_bs == 0 or tot_counter == len(ij_list):
-                    y_pr = self.model_reading_order.predict(input_1 , verbose=0)
+                    y_pr = self.model_zoo.get('reading_order', Model).predict(input_1 , verbose='0')
                     for jb, j in enumerate(batch):
                         if y_pr[jb][0]>=0.5:
                             post_list.append(j)
@@ -802,6 +793,7 @@ class machine_based_reading_order_on_layout:
             alltags=[elem.tag for elem in root_xml.iter()]
             
             ET.register_namespace("",name_space)
+            assert dir_out
             tree_xml.write(os.path.join(dir_out, file_name+'.xml'),
                            xml_declaration=True,
                            method='xml',