diff --git a/can_sniffer/deploy/can-sniffer.service b/can_sniffer/deploy/can-sniffer.service
index 3d14439..02cda6f 100644
--- a/can_sniffer/deploy/can-sniffer.service
+++ b/can_sniffer/deploy/can-sniffer.service
@@ -41,8 +41,9 @@ StandardError=journal
 SyslogIdentifier=can-sniffer
 
 # Security hardening (RPI5 совместимо)
-NoNewPrivileges=yes
-ProtectSystem=strict
+# NoNewPrivileges отключен для поддержки sudo (shutdown/reboot)
+NoNewPrivileges=no
+ProtectSystem=full
 ProtectHome=read-only
 PrivateTmp=yes
 ReadWritePaths=/opt/can_sniffer/data /opt/can_sniffer/logs
@@ -51,9 +52,11 @@ ReadWritePaths=/opt/can_sniffer/data /opt/can_sniffer/logs
 CapabilityBoundingSet=CAP_NET_RAW CAP_NET_ADMIN
 AmbientCapabilities=CAP_NET_RAW CAP_NET_ADMIN
 
-# Доступ к UART для Flipper Zero (/dev/ttyAMA0)
-SupplementaryGroups=dialout
+# Доступ к UART для Flipper Zero (/dev/ttyAMA0) и I2C для UPS
+SupplementaryGroups=dialout i2c gpio
 DeviceAllow=/dev/ttyAMA0 rw
+DeviceAllow=/dev/i2c-1 rw
+DeviceAllow=/dev/gpiomem rw
 
 [Install]
 WantedBy=multi-user.target
diff --git a/can_sniffer/requirements.txt b/can_sniffer/requirements.txt
index a3bb901..e3cec48 100644
--- a/can_sniffer/requirements.txt
+++ b/can_sniffer/requirements.txt
@@ -3,4 +3,6 @@ pydantic-settings>=2.0.0
 python-can>=4.0.0
 psycopg2-binary>=2.9.0
 pyserial>=3.5
+smbus2>=0.4.0
+gpiozero>=2.0.0
 
diff --git a/can_sniffer/src/flipper/providers/ups_provider.py b/can_sniffer/src/flipper/providers/ups_provider.py
index 11cbbdd..0f8f14a 100644
--- a/can_sniffer/src/flipper/providers/ups_provider.py
+++ b/can_sniffer/src/flipper/providers/ups_provider.py
@@ -62,20 +62,32 @@ class UPSProvider(BaseProvider):
             import smbus2
             self._bus = smbus2.SMBus(self.I2C_BUS)
             self._available = True
-        except ImportError:
+            logger.info(f"UPS I2C initialized on bus {self.I2C_BUS}, address 0x{self.I2C_ADDRESS:02X}")
+        except ImportError as e:
             self._last_error = "smbus2 not installed"
             self._available = False
+            logger.warning(f"UPS unavailable: smbus2 not installed. Install with: pip install smbus2")
+        except PermissionError as e:
+            self._last_error = f"I2C permission denied: {e}"
+            self._available = False
+            logger.error(f"UPS I2C permission denied. Add user to i2c group: sudo usermod -aG i2c $USER")
+        except FileNotFoundError as e:
+            self._last_error = f"I2C bus not found: {e}"
+            self._available = False
+            logger.error(f"I2C bus {self.I2C_BUS} not found. Enable I2C in raspi-config.")
         except Exception as e:
             self._last_error = f"I2C init failed: {e}"
             self._available = False
+            logger.error(f"UPS I2C init failed: {e}")
 
         try:
             from gpiozero import Button
             self._pld_button = Button(self.PLD_PIN)
+            logger.debug(f"UPS PLD GPIO {self.PLD_PIN} initialized")
         except ImportError:
-            pass  # GPIO optional
-        except Exception:
-            pass  # GPIO optional
+            logger.debug("gpiozero not installed, power loss detection disabled")
+        except Exception as e:
+            logger.debug(f"GPIO init failed (optional): {e}")
 
     def _read_voltage_and_capacity(self) -> Tuple[float, float]:
         """
@@ -131,10 +143,20 @@ class UPSProvider(BaseProvider):
             Input voltage in V
         """
         try:
-            from subprocess import check_output
-            output = check_output(["vcgencmd", "pmic_read_adc", "EXT5V_V"]).decode("utf-8")
-            value_str = output.split("=")[1].strip().rstrip("V")
-            return float(value_str)
+            from subprocess import check_output, DEVNULL
+            # Try common vcgencmd paths
+            vcgencmd_paths = ["/usr/bin/vcgencmd", "/opt/vc/bin/vcgencmd", "vcgencmd"]
+            for vcgencmd in vcgencmd_paths:
+                try:
+                    output = check_output(
+                        [vcgencmd, "pmic_read_adc", "EXT5V_V"],
+                        stderr=DEVNULL
+                    ).decode("utf-8")
+                    value_str = output.split("=")[1].strip().rstrip("V")
+                    return float(value_str)
+                except FileNotFoundError:
+                    continue
+            return 0.0
         except Exception:
             return 0.0