diff --git a/README.md b/README.md
index 7e855016d..ea5b32699 100644
--- a/README.md
+++ b/README.md
@@ -42,6 +42,7 @@ The source code is published under GPLv3 with OpenSSL exception, the license is
 * Emoji alpha codes ([MIT License](https://github.com/emojione/emojione/blob/master/extras/alpha-codes/LICENSE.md))
 * Catch test framework ([Boost License](https://github.com/philsquared/Catch/blob/master/LICENSE.txt))
 * xxHash ([BSD License](https://github.com/Cyan4973/xxHash/blob/dev/LICENSE))
+* QR Code generator ([MIT License](https://github.com/nayuki/QR-Code-generator#license))
 
 ## Build instructions
 
diff --git a/Telegram/CMakeLists.txt b/Telegram/CMakeLists.txt
index a052fd8a1..fb17c2565 100644
--- a/Telegram/CMakeLists.txt
+++ b/Telegram/CMakeLists.txt
@@ -17,6 +17,7 @@ if (NOT DESKTOP_APP_DISABLE_SPELLCHECK)
 endif()
 add_subdirectory(lib_storage)
 add_subdirectory(lib_lottie)
+add_subdirectory(lib_qr)
 add_subdirectory(codegen)
 
 include(lib_ui/cmake/generate_styles.cmake)
@@ -76,11 +77,13 @@ PRIVATE
     desktop-app::lib_tl
     desktop-app::lib_storage
     desktop-app::lib_lottie
+    desktop-app::lib_qr
     desktop-app::lib_ffmpeg
     desktop-app::external_lz4
     desktop-app::external_rlottie
     desktop-app::external_zlib
     desktop-app::external_qt
+    desktop-app::external_qr_code_generator
     desktop-app::external_auto_updates
     desktop-app::external_openssl
     desktop-app::external_opus
@@ -530,18 +533,22 @@ PRIVATE
     inline_bots/inline_bot_send_data.h
     inline_bots/inline_results_widget.cpp
     inline_bots/inline_results_widget.h
-    intro/introwidget.cpp
-    intro/introwidget.h
-    intro/introcode.cpp
-    intro/introcode.h
-    intro/introphone.cpp
-    intro/introphone.h
-    intro/intropwdcheck.cpp
-    intro/intropwdcheck.h
-    intro/introsignup.cpp
-    intro/introsignup.h
-    intro/introstart.cpp
-    intro/introstart.h
+    intro/intro_code.cpp
+    intro/intro_code.h
+    intro/intro_password_check.cpp
+    intro/intro_password_check.h
+    intro/intro_phone.cpp
+    intro/intro_phone.h
+    intro/intro_qr.cpp
+    intro/intro_qr.h
+    intro/intro_signup.cpp
+    intro/intro_signup.h
+    intro/intro_start.cpp
+    intro/intro_start.h
+    intro/intro_step.cpp
+    intro/intro_step.h
+    intro/intro_widget.cpp
+    intro/intro_widget.h
     lang/lang_cloud_manager.cpp
     lang/lang_cloud_manager.h
     lang/lang_file_parser.cpp
@@ -631,14 +638,8 @@ PRIVATE
     media/view/media_view_group_thumbs.h
     media/view/media_view_overlay_widget.cpp
     media/view/media_view_overlay_widget.h
-    mtproto/auth_key.cpp
-    mtproto/auth_key.h
-    mtproto/concurrent_sender.cpp
-    mtproto/concurrent_sender.h
     mtproto/config_loader.cpp
     mtproto/config_loader.h
-    mtproto/connection.cpp
-    mtproto/connection.h
     mtproto/connection_abstract.cpp
     mtproto/connection_abstract.h
     mtproto/connection_http.cpp
@@ -647,10 +648,7 @@ PRIVATE
     mtproto/connection_resolving.h
     mtproto/connection_tcp.cpp
     mtproto/connection_tcp.h
-    mtproto/core_types.cpp
     mtproto/core_types.h
-    mtproto/dcenter.cpp
-    mtproto/dcenter.h
     mtproto/dc_options.cpp
     mtproto/dc_options.h
     mtproto/dedicated_file_loader.cpp
@@ -659,13 +657,11 @@ PRIVATE
     mtproto/facade.h
     mtproto/mtp_instance.cpp
     mtproto/mtp_instance.h
-    mtproto/rsa_public_key.cpp
-    mtproto/rsa_public_key.h
-    mtproto/rpc_sender.cpp
-    mtproto/rpc_sender.h
     mtproto/sender.h
     mtproto/session.cpp
     mtproto/session.h
+    mtproto/session_private.cpp
+    mtproto/session_private.h
     mtproto/special_config_request.cpp
     mtproto/special_config_request.h
     mtproto/type_utils.h
@@ -788,8 +784,14 @@ PRIVATE
     settings/settings_privacy_controllers.h
     settings/settings_privacy_security.cpp
     settings/settings_privacy_security.h
+    storage/download_manager_mtproto.cpp
+    storage/download_manager_mtproto.h
     storage/file_download.cpp
     storage/file_download.h
+    storage/file_download_mtproto.cpp
+    storage/file_download_mtproto.h
+    storage/file_download_web.cpp
+    storage/file_download_web.h
     storage/file_upload.cpp
     storage/file_upload.h
     storage/localimageloader.cpp
diff --git a/Telegram/cmake/generate_scheme.cmake b/Telegram/cmake/generate_scheme.cmake
index 4a47ef000..75d3995e2 100644
--- a/Telegram/cmake/generate_scheme.cmake
+++ b/Telegram/cmake/generate_scheme.cmake
@@ -12,6 +12,8 @@ function(generate_scheme target_name script scheme_files)
     set(gen_files
         ${gen_dst}/scheme.cpp
         ${gen_dst}/scheme.h
+        ${gen_dst}/scheme-dump_to_text.cpp
+        ${gen_dst}/scheme-dump_to_text.h
     )
 
     add_custom_command(
diff --git a/Telegram/cmake/lib_mtproto.cmake b/Telegram/cmake/lib_mtproto.cmake
index c0ffc8b83..87a5f5f19 100644
--- a/Telegram/cmake/lib_mtproto.cmake
+++ b/Telegram/cmake/lib_mtproto.cmake
@@ -8,15 +8,43 @@ add_library(lib_mtproto OBJECT)
 init_target(lib_mtproto)
 add_library(tdesktop::lib_mtproto ALIAS lib_mtproto)
 
-target_precompile_headers(lib_mtproto PRIVATE ${src_loc}/mtproto/mtp_pch.h)
+target_precompile_headers(lib_mtproto PRIVATE ${src_loc}/mtproto/mtproto_pch.h)
 nice_target_sources(lib_mtproto ${src_loc}
 PRIVATE
-    mtproto/mtp_abstract_socket.cpp
-    mtproto/mtp_abstract_socket.h
-    mtproto/mtp_tcp_socket.cpp
-    mtproto/mtp_tcp_socket.h
-    mtproto/mtp_tls_socket.cpp
-    mtproto/mtp_tls_socket.h
+    mtproto/details/mtproto_abstract_socket.cpp
+    mtproto/details/mtproto_abstract_socket.h
+    mtproto/details/mtproto_bound_key_creator.cpp
+    mtproto/details/mtproto_bound_key_creator.h
+    mtproto/details/mtproto_dc_key_binder.cpp
+    mtproto/details/mtproto_dc_key_binder.h
+    mtproto/details/mtproto_dc_key_creator.cpp
+    mtproto/details/mtproto_dc_key_creator.h
+    mtproto/details/mtproto_dcenter.cpp
+    mtproto/details/mtproto_dcenter.h
+    mtproto/details/mtproto_domain_resolver.cpp
+    mtproto/details/mtproto_domain_resolver.h
+    mtproto/details/mtproto_dump_to_text.cpp
+    mtproto/details/mtproto_dump_to_text.h
+    mtproto/details/mtproto_received_ids_manager.cpp
+    mtproto/details/mtproto_received_ids_manager.h
+    mtproto/details/mtproto_rsa_public_key.cpp
+    mtproto/details/mtproto_rsa_public_key.h
+    mtproto/details/mtproto_serialized_request.cpp
+    mtproto/details/mtproto_serialized_request.h
+    mtproto/details/mtproto_tcp_socket.cpp
+    mtproto/details/mtproto_tcp_socket.h
+    mtproto/details/mtproto_tls_socket.cpp
+    mtproto/details/mtproto_tls_socket.h
+    mtproto/mtproto_auth_key.cpp
+    mtproto/mtproto_auth_key.h
+    mtproto/mtproto_concurrent_sender.cpp
+    mtproto/mtproto_concurrent_sender.h
+    mtproto/mtproto_dh_utils.cpp
+    mtproto/mtproto_dh_utils.h
+    mtproto/mtproto_proxy_data.cpp
+    mtproto/mtproto_proxy_data.h
+    mtproto/mtproto_rpc_sender.cpp
+    mtproto/mtproto_rpc_sender.h
 )
 
 target_include_directories(lib_mtproto
@@ -27,4 +55,6 @@ PUBLIC
 target_link_libraries(lib_mtproto
 PUBLIC
     tdesktop::lib_scheme
+PRIVATE
+    desktop-app::external_zlib
 )
diff --git a/Telegram/lib_base b/Telegram/lib_base
index e8343f4cc..4592f56c2 160000
--- a/Telegram/lib_base
+++ b/Telegram/lib_base
@@ -1 +1 @@
-Subproject commit e8343f4cc276665939fd1e6a2b25a5d1c4a83cd1
+Subproject commit 4592f56c23cb1d35f9528c1cbcaa17cb3188943c
diff --git a/Telegram/lib_qr b/Telegram/lib_qr
index 1efe65125..9877397db 160000
--- a/Telegram/lib_qr
+++ b/Telegram/lib_qr
@@ -1 +1 @@
-Subproject commit 1efe65125ddca2a4a663c004380f31befd22ea76
+Subproject commit 9877397dbf97b7198d539a3994bf0e9619cf653c
diff --git a/cmake b/cmake
index 0340f7229..3182d2d4a 160000
--- a/cmake
+++ b/cmake
@@ -1 +1 @@
-Subproject commit 0340f722942204ef98c3570266870334c01d2613
+Subproject commit 3182d2d4a7cbfd4290a46ee6baeb3355f5028349