diff --git a/handlers/admin/admin.py b/handlers/admin/admin.py
index 04dd72dd..3b74e059 100644
--- a/handlers/admin/admin.py
+++ b/handlers/admin/admin.py
@@ -2,7 +2,7 @@ import logging
 from datetime import datetime
 
 import asyncpg
-from aiogram import Router, types
+from aiogram import Router, types, F
 from aiogram.filters import Command
 
 from auth import login_with_credentials
diff --git a/handlers/admin/admin_panel.py b/handlers/admin/admin_panel.py
index d451d4fb..9b9a5548 100644
--- a/handlers/admin/admin_panel.py
+++ b/handlers/admin/admin_panel.py
@@ -2,7 +2,7 @@ import subprocess
 from datetime import datetime
 
 import asyncpg
-from aiogram import Router, types
+from aiogram import Router, types, F
 from aiogram.filters import Command
 from aiogram.fsm.context import FSMContext
 from aiogram.fsm.state import State, StatesGroup
@@ -61,7 +61,7 @@ async def handle_admin_command(message: types.Message):
     )
 
 
-@router.callback_query(lambda c: c.data == "user_stats")
+@router.callback_query(F.data == "user_stats")
 @admin_only()
 async def user_stats_menu(callback_query: CallbackQuery):
     conn = await asyncpg.connect(DATABASE_URL)
@@ -99,14 +99,14 @@ async def user_stats_menu(callback_query: CallbackQuery):
     await callback_query.answer()
 
 
-@router.callback_query(lambda c: c.data == "send_to_alls")
+@router.callback_query(F.data == "send_to_alls")
 @admin_only()
 async def handle_send_to_all(callback_query: CallbackQuery, state: FSMContext):
     await send_message_to_all_clients(callback_query.message, state, from_panel=True)
     await callback_query.answer()
 
 
-@router.callback_query(lambda c: c.data == "backups")
+@router.callback_query(F.data == "backups")
 @admin_only()
 async def handle_backup(message: Message):
     await message.answer("Запускаю бэкап базы данных...")
@@ -114,7 +114,7 @@ async def handle_backup(message: Message):
     await message.answer("Бэкап завершен и отправлен админу.")
 
 
-@router.callback_query(lambda c: c.data == "restart_bot")
+@router.callback_query(F.data == "restart_bot")
 @admin_only()
 async def handle_restart(callback_query: CallbackQuery):
     if callback_query.from_user.id == ADMIN_ID:
@@ -136,7 +136,7 @@ async def handle_restart(callback_query: CallbackQuery):
         )
 
 
-@router.callback_query(lambda c: c.data == "user_editor")
+@router.callback_query(F.data == "user_editor")
 @admin_only()
 async def user_editor_menu(callback_query: CallbackQuery):
     keyboard = InlineKeyboardMarkup(
@@ -161,7 +161,7 @@ async def user_editor_menu(callback_query: CallbackQuery):
     )
 
 
-@router.callback_query(lambda c: c.data == "back_to_admin_menu")
+@router.callback_query(F.data == "back_to_admin_menu")
 @admin_only()
 async def back_to_admin_menu(callback_query: CallbackQuery):
     try:
diff --git a/handlers/admin/user_editor.py b/handlers/admin/user_editor.py
index 321eab5e..495c6d37 100644
--- a/handlers/admin/user_editor.py
+++ b/handlers/admin/user_editor.py
@@ -32,7 +32,7 @@ class UserEditorState(StatesGroup):
     waiting_for_expiry_time = State()
 
 
-@router.callback_query(lambda c: c.data == "search_by_tg_id")
+@router.callback_query(F.data == "search_by_tg_id")
 async def prompt_tg_id(callback_query: CallbackQuery, state: FSMContext):
     await callback_query.message.edit_text("Введите tg_id клиента:")
     await state.set_state(UserEditorState.waiting_for_tg_id)
@@ -91,7 +91,7 @@ async def handle_tg_id_input(message: types.Message, state: FSMContext):
         await conn.close()
 
 
-@router.callback_query(lambda c: c.data.startswith("change_balance_"))
+@router.callback_query(F.data.startswith("change_balance_"))
 async def process_balance_change(callback_query: CallbackQuery, state: FSMContext):
     tg_id = int(callback_query.data.split("_")[2])
     await state.update_data(tg_id=tg_id)
@@ -134,7 +134,7 @@ async def handle_new_balance_input(message: types.Message, state: FSMContext):
     await state.clear()
 
 
-@router.callback_query(lambda c: c.data.startswith("edit_key_"))
+@router.callback_query(F.data.startswith("edit_key_"))
 async def process_key_edit(callback_query: CallbackQuery):
     email = callback_query.data.split("_", 2)[2]
 
@@ -219,7 +219,7 @@ async def process_key_edit(callback_query: CallbackQuery):
     await callback_query.answer()
 
 
-@router.callback_query(lambda c: c.data == "search_by_key_name")
+@router.callback_query(F.data == "search_by_key_name")
 async def prompt_key_name(callback_query: CallbackQuery, state: FSMContext):
     await callback_query.message.edit_text("Введите имя ключа:")
     await state.set_state(UserEditorState.waiting_for_key_name)
@@ -295,7 +295,7 @@ async def handle_key_name_input(message: types.Message, state: FSMContext):
     await state.clear()
 
 
-@router.callback_query(lambda c: c.data.startswith("change_expiry|"))
+@router.callback_query(F.data.startswith("change_expiry|"))
 async def prompt_expiry_change(callback_query: CallbackQuery, state: FSMContext):
     email = callback_query.data.split("|")[1]
     await callback_query.message.edit_text(
@@ -392,7 +392,7 @@ async def renew_server_key(server_id, tg_id, client_id, email, new_expiry_time):
         )
 
 
-@router.callback_query(lambda c: c.data.startswith("delete_key_admin|"))
+@router.callback_query(F.data.startswith("delete_key_admin|"))
 async def process_callback_delete_key(callback_query: types.CallbackQuery):
     tg_id = callback_query.from_user.id
     email = callback_query.data.split("|")[1]
@@ -440,7 +440,7 @@ async def process_callback_delete_key(callback_query: types.CallbackQuery):
     await callback_query.answer()
 
 
-@router.callback_query(lambda c: c.data.startswith("confirm_delete_admin|"))
+@router.callback_query(F.data.startswith("confirm_delete_admin|"))
 async def process_callback_confirm_delete(callback_query: types.CallbackQuery):
     tg_id = callback_query.from_user.id
     client_id = callback_query.data.split("|")[1]
@@ -529,7 +529,7 @@ async def delete_key_from_db(client_id):
         await conn.close()
 
 
-@router.callback_query(lambda c: c.data == "back_to_user_editor")
+@router.callback_query(F.data == "back_to_user_editor")
 async def back_to_user_editor(callback_query: CallbackQuery):
     await back_to_admin_menu(callback_query)
 
diff --git a/handlers/keys/keys.py b/handlers/keys/keys.py
index 8ae8ee73..b1d136e7 100644
--- a/handlers/keys/keys.py
+++ b/handlers/keys/keys.py
@@ -5,7 +5,7 @@ import os
 from datetime import datetime, timedelta
 
 import asyncpg
-from aiogram import Router, types
+from aiogram import Router, types, F
 from aiogram.types import BufferedInputFile
 
 from auth import login_with_credentials
@@ -46,7 +46,7 @@ logging.basicConfig(
 logger = logging.getLogger(__name__)
 
 
-@router.callback_query(lambda c: c.data == "view_keys")
+@router.callback_query(F.data == "view_keys")
 async def process_callback_view_keys(callback_query: types.CallbackQuery):
     tg_id = callback_query.from_user.id
 
@@ -125,7 +125,7 @@ async def process_callback_view_keys(callback_query: types.CallbackQuery):
     await callback_query.answer()
 
 
-@router.callback_query(lambda c: c.data.startswith("view_key|"))
+@router.callback_query(F.data.startswith("view_key|"))
 async def process_callback_view_key(callback_query: types.CallbackQuery):
     tg_id = callback_query.from_user.id
     key_name, client_id = (
@@ -254,7 +254,7 @@ async def process_callback_view_key(callback_query: types.CallbackQuery):
     await callback_query.answer()
 
 
-@router.callback_query(lambda c: c.data.startswith("update_subscription|"))
+@router.callback_query(F.data.startswith("update_subscription|"))
 async def process_callback_update_subscription(callback_query: types.CallbackQuery):
     tg_id = callback_query.from_user.id
     client_id = callback_query.data.split("|")[1]
@@ -381,7 +381,7 @@ async def update_key_on_server(tg_id, client_id, email, expiry_time, server_id):
         )
 
 
-@router.callback_query(lambda c: c.data.startswith("delete_key|"))
+@router.callback_query(F.data.startswith("delete_key|"))
 async def process_callback_delete_key(callback_query: types.CallbackQuery):
     tg_id = callback_query.from_user.id
     client_id = callback_query.data.split("|")[1]
@@ -427,7 +427,7 @@ async def process_callback_delete_key(callback_query: types.CallbackQuery):
     await callback_query.answer()
 
 
-@router.callback_query(lambda c: c.data.startswith("renew_key|"))
+@router.callback_query(F.data.startswith("renew_key|"))
 async def process_callback_renew_key(callback_query: types.CallbackQuery):
     tg_id = callback_query.from_user.id
     client_id = callback_query.data.split("|")[1]
@@ -518,7 +518,7 @@ async def process_callback_renew_key(callback_query: types.CallbackQuery):
     await callback_query.answer()
 
 
-@router.callback_query(lambda c: c.data.startswith("confirm_delete|"))
+@router.callback_query(F.data.startswith("confirm_delete|"))
 async def process_callback_confirm_delete(callback_query: types.CallbackQuery):
     tg_id = callback_query.from_user.id
     client_id = callback_query.data.split("|")[1]
@@ -615,7 +615,7 @@ async def delete_key_from_db(client_id):
         await conn.close()
 
 
-@router.callback_query(lambda c: c.data.startswith("renew_plan|"))
+@router.callback_query(F.data.startswith("renew_plan|"))
 async def process_callback_renew_plan(callback_query: types.CallbackQuery):
     tg_id = callback_query.from_user.id
     plan, client_id = (
diff --git a/handlers/payment/freekassa_pay.py b/handlers/payment/freekassa_pay.py
index e745d54f..86b819be 100644
--- a/handlers/payment/freekassa_pay.py
+++ b/handlers/payment/freekassa_pay.py
@@ -4,7 +4,7 @@ import time
 import uuid
 
 import requests
-from aiogram import Router, types
+from aiogram import Router, types, F
 from aiogram.fsm.context import FSMContext
 from aiogram.fsm.state import State, StatesGroup
 from aiogram.types import InlineKeyboardButton, InlineKeyboardMarkup
@@ -91,7 +91,7 @@ async def freekassa_webhook(request):
     return web.Response(status=200)
 
 
-@router.callback_query(lambda c: c.data == "pay_freekassa")
+@router.callback_query(F.data == "pay_freekassa")
 async def process_callback_pay_freekassa(
     callback_query: types.CallbackQuery, state: FSMContext
 ):
@@ -121,14 +121,14 @@ async def process_callback_pay_freekassa(
     await callback_query.answer()
 
 
-@router.callback_query(lambda c: c.data == "back_to_profile")
+@router.callback_query(F.data == "back_to_profile")
 async def back_to_profile_handler(
     callback_query: types.CallbackQuery, state: FSMContext
 ):
     await process_callback_view_profile(callback_query, state)
 
 
-@router.callback_query(lambda c: c.data.startswith("amount|"))
+@router.callback_query(F.data.startswith("amount|"))
 async def process_amount_selection(
     callback_query: types.CallbackQuery, state: FSMContext
 ):
@@ -160,7 +160,7 @@ async def process_amount_selection(
     await callback_query.answer()
 
 
-@router.callback_query(lambda c: c.data == "enter_custom_amount")
+@router.callback_query(F.data == "enter_custom_amount")
 async def process_enter_custom_amount(
     callback_query: types.CallbackQuery, state: FSMContext
 ):
diff --git a/handlers/payment/yookassa_pay.py b/handlers/payment/yookassa_pay.py
index 6acf13b9..6e238c83 100644
--- a/handlers/payment/yookassa_pay.py
+++ b/handlers/payment/yookassa_pay.py
@@ -1,7 +1,7 @@
 import logging
 import uuid
 
-from aiogram import Router, types
+from aiogram import Router, types, F
 from aiogram.fsm.context import FSMContext
 from aiogram.fsm.state import State, StatesGroup
 from aiogram.types import InlineKeyboardButton, InlineKeyboardMarkup
@@ -61,7 +61,7 @@ async def send_message_with_deletion(
     return sent_message
 
 
-@router.callback_query(lambda c: c.data == "replenish_balance")
+@router.callback_query(F.data == "replenish_balance")
 async def process_callback_replenish_balance(
     callback_query: types.CallbackQuery, state: FSMContext
 ):
@@ -96,14 +96,14 @@ async def process_callback_replenish_balance(
     await callback_query.answer()
 
 
-@router.callback_query(lambda c: c.data == "back_to_profile")
+@router.callback_query(F.data == "back_to_profile")
 async def back_to_profile_handler(
     callback_query: types.CallbackQuery, state: FSMContext
 ):
     await process_callback_view_profile(callback_query, state)
 
 
-@router.callback_query(lambda c: c.data.startswith("amount|"))
+@router.callback_query(F.data.startswith("amount|"))
 async def process_amount_selection(
     callback_query: types.CallbackQuery, state: FSMContext
 ):
@@ -233,7 +233,7 @@ async def yookassa_webhook(request):
     return web.Response(status=200)
 
 
-@router.callback_query(lambda c: c.data == "enter_custom_amount")
+@router.callback_query(F.data == "enter_custom_amount")
 async def process_enter_custom_amount(
     callback_query: types.CallbackQuery, state: FSMContext
 ):
diff --git a/handlers/profile.py b/handlers/profile.py
index 59a97274..c43f6b95 100644
--- a/handlers/profile.py
+++ b/handlers/profile.py
@@ -1,7 +1,7 @@
 import logging
 import os
 
-from aiogram import Router, types
+from aiogram import Router, types,F
 from aiogram.fsm.context import FSMContext
 from aiogram.fsm.state import State, StatesGroup
 from aiogram.types import BufferedInputFile, InlineKeyboardButton, InlineKeyboardMarkup
@@ -108,7 +108,7 @@ async def process_callback_view_profile(
     await callback_query.answer()
 
 
-@router.callback_query(lambda c: c.data == "invite")
+@router.callback_query(F.data == "invite")
 async def invite_handler(callback_query: types.CallbackQuery):
     tg_id = callback_query.from_user.id
     referral_link = get_referral_link(tg_id)
@@ -129,6 +129,6 @@ async def invite_handler(callback_query: types.CallbackQuery):
     await callback_query.answer()
 
 
-@router.callback_query(lambda c: c.data == "view_profile")
+@router.callback_query(F.data == "view_profile")
 async def view_profile_handler(callback_query: types.CallbackQuery, state: FSMContext):
     await process_callback_view_profile(callback_query, state)
diff --git a/handlers/start.py b/handlers/start.py
index 532d9c7f..3c5d6c37 100644
--- a/handlers/start.py
+++ b/handlers/start.py
@@ -2,7 +2,7 @@ import logging
 import os
 
 import asyncpg
-from aiogram import Router
+from aiogram import Router,F
 from aiogram.filters import Command
 from aiogram.fsm.state import State, StatesGroup
 from aiogram.types import (
@@ -86,7 +86,7 @@ async def start_command(message: Message):
     await send_welcome_message(message.chat.id, trial_status)
 
 
-@router.callback_query(lambda c: c.data == "connect_vpn")
+@router.callback_query(F.data == "connect_vpn")
 async def handle_connect_vpn(callback_query: CallbackQuery):
     await callback_query.message.delete()
     user_id = callback_query.from_user.id
@@ -153,23 +153,20 @@ async def handle_connect_vpn(callback_query: CallbackQuery):
     await callback_query.answer()
 
 
-@router.callback_query(lambda c: c.data == "about_vpn")
+@router.callback_query(F.data == "about_vpn")
 async def handle_about_vpn(callback_query: CallbackQuery):
     await callback_query.message.delete()
 
-    bot_version = "3.0.1_beta"
-    info_message = ABOUT_VPN.format(bot_version=bot_version)
-
     button_back = InlineKeyboardButton(text="⬅️ Назад", callback_data="back_to_menu")
     inline_keyboard_back = InlineKeyboardMarkup(inline_keyboard=[[button_back]])
 
     await callback_query.message.answer(
-        info_message, parse_mode="HTML", reply_markup=inline_keyboard_back
+        ABOUT_VPN, parse_mode="HTML", reply_markup=inline_keyboard_back
     )
     await callback_query.answer()
 
 
-@router.callback_query(lambda c: c.data == "back_to_menu")
+@router.callback_query(F.data == "back_to_menu")
 async def handle_back_to_menu(callback_query: CallbackQuery):
     await callback_query.message.delete()
     trial_status = await get_trial(callback_query.from_user.id)