diff --git a/mocks/trezor/crypto/.mock-generated b/mocks/trezor/crypto/.mock-generated
deleted file mode 100644
index e69de29bb..000000000
diff --git a/mocks/trezor/crypto/__init__.py b/mocks/trezor/crypto/__init__.py
deleted file mode 100644
index e69de29bb..000000000
diff --git a/mocks/trezor/crypto/hashlib.py b/mocks/trezor/crypto/hashlib.py
index 12b76db0b..97fe9c0ce 100644
--- a/mocks/trezor/crypto/hashlib.py
+++ b/mocks/trezor/crypto/hashlib.py
@@ -5,26 +5,26 @@ def ripemd160(data: bytes=None) -> Ripemd160:
     Creates a hash context object.
     '''
 
-# ../extmod/modtrezorcrypto/modtrezorcrypto-sha3-512.h
-def sha3_512(data: bytes=None) -> Sha3_512:
+# ../extmod/modtrezorcrypto/modtrezorcrypto-sha256.h
+def sha256(data: bytes=None) -> Sha256:
     '''
     Creates a hash context object.
     '''
 
-# ../extmod/modtrezorcrypto/modtrezorcrypto-sha512.h
-def sha512(data: bytes=None) -> Sha512:
+# ../extmod/modtrezorcrypto/modtrezorcrypto-sha3-256.h
+def sha3_256(data: bytes=None) -> Sha3_256:
     '''
     Creates a hash context object.
     '''
 
-# ../extmod/modtrezorcrypto/modtrezorcrypto-sha256.h
-def sha256(data: bytes=None) -> Sha256:
+# ../extmod/modtrezorcrypto/modtrezorcrypto-sha3-512.h
+def sha3_512(data: bytes=None) -> Sha3_512:
     '''
     Creates a hash context object.
     '''
 
-# ../extmod/modtrezorcrypto/modtrezorcrypto-sha3-256.h
-def sha3_256(data: bytes=None) -> Sha3_256:
+# ../extmod/modtrezorcrypto/modtrezorcrypto-sha512.h
+def sha512(data: bytes=None) -> Sha512:
     '''
     Creates a hash context object.
     '''
diff --git a/mocks/trezor/ui/display.py b/mocks/trezor/ui/display.py
index 9225549e9..63540dde4 100644
--- a/mocks/trezor/ui/display.py
+++ b/mocks/trezor/ui/display.py
@@ -1,4 +1,16 @@
 
+# ../extmod/modtrezorui/modtrezorui-display.h
+def clear() -> None
+    '''
+    Clear display (with black color)
+    '''
+
+# ../extmod/modtrezorui/modtrezorui-display.h
+def refresh() -> None
+    '''
+    Refresh display (update screen)
+    '''
+
 # ../extmod/modtrezorui/modtrezorui-display.h
 def bar(x: int, y: int, w: int, h: int, fgcolor: int, bgcolor: int=None, radius: int=None) -> None:
     '''
diff --git a/tools/build_mocks b/tools/build_mocks
index 625a59a02..15dd1c6b1 100755
--- a/tools/build_mocks
+++ b/tools/build_mocks
@@ -14,13 +14,13 @@ def split_to_parts(line, mod_file=None):
         # Parse name of method from line like 'def trezor.config.get():'
         current_method = line[4:].split('(')[0]
         #print("Current method", current_method)
-        
+
         *current_package, method_name = current_method.split('.')
 
         yield (current_package, "\n")
         yield (current_package, '# ' + mod_file + "\n")
         line = line.replace(current_method, method_name)
-        
+
     yield (current_package, line)
 
 def store_to_file(dest, parts):
@@ -29,15 +29,15 @@ def store_to_file(dest, parts):
             (package, line) = parts.__next__()
         except StopIteration:
             return
-    
+
         dir_path = os.path.abspath(os.path.join(dest, *package[:-1]))
         filename = package[-1]
-        
+
         if not os.path.exists(dir_path):
             os.makedirs(dir_path)
             open(os.path.join(dir_path, '__init__.py'), 'w').close()
             open(os.path.join(dir_path, '.mock-generated'), 'w').close()
-        
+
         f = open(os.path.join(dir_path, filename + '.py'), 'a')
         f.write(line)
         f.close()
@@ -50,10 +50,10 @@ def build_module(mod_file, dest):
     for l in open(mod_file):
         if not l.startswith(COMMENT_PREFIX):
             continue
-        
+
         l = l[len(COMMENT_PREFIX):]#.strip()
         store_to_file(dest, split_to_parts(l, mod_file))
-    
+
 def build_directory(dir, dest):
     print("Building mocks for", dir, "to", dest)
     for pkg in os.listdir(dir):
@@ -77,7 +77,7 @@ def clear_directory(top_dir):
                 pass
 
         os.rmdir(root)
-        
+
 if __name__ == '__main__':
     clear_directory('../mocks')
     build_directory('../extmod', '../mocks')