diff --git a/prj.conf b/prj.conf
index e93626c..9bdcbdc 100644
--- a/prj.conf
+++ b/prj.conf
@@ -1,72 +1,70 @@
 # VesiScan BASIC - Zephyr configuration
-# Stage 1: GPIO + Power Control + LED + Debug Logging
-# Stage 2: BLE (NUS)
 
 CONFIG_GPIO=y
 
 # Debug Message (RTT)
-# Build-time switch for project DBG_PRINTF/DBG_CORE/DBG_ERR macros.
+# Build-time switch for project DBG_PRINTF/DBG_CORE/DBG_ERR macros
 CONFIG_VESIS_DEBUG_PRINT=n
-# Zephyr logging subsystem enable.
+# Zephyr logging subsystem enable
 CONFIG_LOG=y
-# Print logs immediately when log API is called.
+# Print logs immediately when log API is called
 CONFIG_LOG_MODE_IMMEDIATE=y
-# Default log level: 3 = INFO.
+# Default log level: 3 = INFO
 CONFIG_LOG_DEFAULT_LEVEL=2
-# Do not add ANSI color codes to logs.
+# Do not add ANSI color codes to logs
 CONFIG_LOG_BACKEND_SHOW_COLOR=n
-# Enable printk().
+# Enable printk()
 CONFIG_PRINTK=y
-# Send Zephyr LOG output to SEGGER RTT.
+# Send Zephyr LOG output to SEGGER RTT
 CONFIG_LOG_BACKEND_RTT=y
-# Enable SEGGER RTT support.
+# Enable SEGGER RTT support
 CONFIG_USE_SEGGER_RTT=y
-# Enable Zephyr console subsystem.
+# Enable Zephyr console subsystem
 CONFIG_CONSOLE=y
-# Send console/printk output to RTT.
+# Send console/printk output to RTT
 CONFIG_RTT_CONSOLE=y
-# If RTT buffer is full, wait instead of dropping logs.
+# If RTT buffer is full, wait instead of dropping logs
 CONFIG_LOG_BACKEND_RTT_MODE_BLOCK=y
-# RTT log backend output buffer size.
+# RTT log backend output buffer size
 CONFIG_LOG_BACKEND_RTT_OUTPUT_BUFFER_SIZE=1024
 
-# Disable UART logging/console/serial driver. This project uses RTT instead of UART.
+# Disable UART logging/console/serial driver. This project uses RTT instead of UART
 CONFIG_LOG_BACKEND_UART=n
 CONFIG_SERIAL=n
 CONFIG_UART_CONSOLE=n
 
 # BLE stack
-# Enable Zephyr Bluetooth host stack.
+# Enable Zephyr Bluetooth host stack
 CONFIG_BT=y
-# Keep Bluetooth internal logs at warning level.
+# Keep Bluetooth internal logs at warning level
 CONFIG_BT_LOG_LEVEL_WRN=y
-# Operate as a BLE peripheral device.
+# Operate as a BLE peripheral device
 CONFIG_BT_PERIPHERAL=y
-# Default local device name. Runtime advertising name is set from SERIAL_NO by bt_set_name().
-CONFIG_BT_DEVICE_NAME="VBT260300ZZ"
-# Allow runtime BLE name change with bt_set_name(SERIAL_NO).
+# Default local device name. Runtime advertising name is set from SERIAL_NO by bt_set_name()
+CONFIG_BT_DEVICE_NAME="VBT2608000Z"
+# Allow runtime BLE name change with bt_set_name(SERIAL_NO)
 CONFIG_BT_DEVICE_NAME_DYNAMIC=y
-# Maximum runtime BLE name length. Current serial number is 12 characters.
+# Maximum runtime BLE name length. Current serial number is 12 characters
 CONFIG_BT_DEVICE_NAME_MAX=16
-# Allow only one simultaneous peripheral link.
+# Allow only one simultaneous peripheral link
 CONFIG_BT_MAX_CONN=1
 
 # BLE NUS (Nordic UART Service)
-# Enable Nordic UART Service for BLE data exchange.
+# Enable Nordic UART Service for BLE data exchange
 CONFIG_BT_NUS=y
 
 # BLE PHY
-# Disable 2M PHY so the link stays on 1M PHY.
+# Disable 2M PHY so the link stays on 1M PHY
 CONFIG_BT_CTLR_PHY_2M=n
 
 # GATT / MTU
-# Enable GATT client support. May be removable if no client API is used.
+# Enable GATT client support. May be removable if no client API is used
 CONFIG_BT_GATT_CLIENT=y
-# L2CAP TX MTU. ATT MTU is this value minus 3 bytes.
+# L2CAP TX MTU. ATT MTU is this value minus 3 bytes
 CONFIG_BT_L2CAP_TX_MTU=247
-# BLE ACL TX buffer size for larger MTU packets.
+# BLE ACL TX buffer size for larger MTU packets
 CONFIG_BT_BUF_ACL_TX_SIZE=251
-# BLE ACL RX buffer size for larger MTU packets.
+# BLE ACL RX buffer size for larger MTU packets
 CONFIG_BT_BUF_ACL_RX_SIZE=251
 
 # Connection parameters
@@ -76,91 +74,90 @@ CONFIG_BT_PERIPHERAL_PREF_MIN_INT=24
 CONFIG_BT_PERIPHERAL_PREF_MAX_INT=48
 # Slave latency 0: do not skip connection events
 CONFIG_BT_PERIPHERAL_PREF_LATENCY=0
-# Supervision timeout: 1000 x 10ms = 10s.
+# Supervision timeout: 1000 x 10ms = 10s
 CONFIG_BT_PERIPHERAL_PREF_TIMEOUT=1000
 
 # BLE security (production)
-# Enable BLE Security Manager Protocol for pairing/bonding.
+# Enable BLE Security Manager Protocol for pairing/bonding
 CONFIG_BT_SMP=y
-# Allow bonding so pairing information can be stored and reused.
 # Enable mbedTLS/nRF Security backend for Bluetooth PSA crypto calls
 CONFIG_MBEDTLS=y
 CONFIG_MBEDTLS_PSA_CRYPTO_C=y
 # Allow bonding so pairing information can be stored and reused
 CONFIG_BT_BONDABLE=y
-# App provides the passkey through the auth callback.
+# App provides the passkey through the auth callback
 CONFIG_BT_APP_PASSKEY=y
 # Require MITM-protected pairing.
 CONFIG_BT_SMP_ENFORCE_MITM=y
-# Allow only LE Secure Connections pairing.
+# Allow only LE Secure Connections pairing
 CONFIG_BT_SMP_SC_ONLY=y
-# Store and restore BLE bond/security information through settings.
+# Store and restore BLE bond/security information through settings
 CONFIG_BT_SETTINGS=y
 # Maximum number of stored bonded peers.
 CONFIG_BT_MAX_PAIRED=1
-# Production secure boot: disable flash patching so only signed flash code can run.
+# Production secure boot: disable flash patching so only signed flash code can run
 CONFIG_DISABLE_FLASH_PATCH=y
 
 # ADC (battery)
-# Enable Zephyr ADC driver for battery voltage measurement.
+# Enable Zephyr ADC driver for battery voltage measurement
 CONFIG_ADC=y
 
 # I2C (IMU: ICM42670P)
-# Enable Zephyr I2C driver for IMU communication.
+# Enable Zephyr I2C driver for IMU communication
 CONFIG_I2C=y
 
 # Direct nrfx SPIM3 driver for ADC121S051
-# Enable nrfx SPIM driver for direct echo ADC SPI control.
+# Enable nrfx SPIM driver for direct echo ADC SPI control
 CONFIG_NRFX_SPIM=y
 
 # System
-# Heap memory available for runtime dynamic allocation.
+# Heap memory available for runtime dynamic allocation
 CONFIG_HEAP_MEM_POOL_SIZE=4096
-# Stack size for Zephyr system workqueue thread.
+# Stack size for Zephyr system workqueue thread
 CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2048
 
 # BLE RX stack sizes
-# BLE RX thread stack size. Helps prevent overflow during RX/security processing.
+# BLE RX thread stack size. Helps prevent overflow during RX/security processing
 CONFIG_BT_RX_STACK_SIZE=4096
 
 # DFU
-# Build the application for MCUboot bootloader environment.
+# Build the application for MCUboot bootloader environment
 CONFIG_BOOTLOADER_MCUBOOT=y
-# Enable zcbor library used by mcumgr/SMP/DFU CBOR payloads.
+# Enable zcbor library used by mcumgr/SMP/DFU CBOR payloads
 CONFIG_ZCBOR=y
 # Version string used by MCUboot imgtool signing and versioned DFU zip naming
-CONFIG_MCUBOOT_IMGTOOL_SIGN_VERSION="2.0.3+0"
+CONFIG_MCUBOOT_IMGTOOL_SIGN_VERSION="2.0.5+0"
 
 # Internal flash
-# Enable internal flash driver.
+# Enable internal flash driver
 CONFIG_FLASH=y
-# Enable flash partition/slot lookup APIs.
+# Enable flash partition/slot lookup APIs
 CONFIG_FLASH_MAP=y
 
 # Persistent application settings (FDS replacement)
-# Enable Zephyr NVS storage.
+# Enable Zephyr NVS storage
 CONFIG_NVS=y
-# Enable Zephyr settings subsystem.
+# Enable Zephyr settings subsystem
 CONFIG_SETTINGS=y
-# Use NVS as the settings backend.
+# Use NVS as the settings backend
 CONFIG_SETTINGS_NVS=y
-# Number of flash sectors used by settings/NVS backend.
+# Number of flash sectors used by settings/NVS backend
 CONFIG_SETTINGS_NVS_SECTOR_COUNT=2
-# settings_storage partition size. 0x2000 = 8KB.
+# settings_storage partition size. 0x2000 = 8KB
 CONFIG_PM_PARTITION_SIZE_SETTINGS_STORAGE=0x2000
 
 # mcumgr framework
-# Enable mcumgr management framework.
+# Enable mcumgr management framework
 CONFIG_MCUMGR=y
 
 # mcumgr over BLE transport
-# Enable mcumgr/SMP messages over BLE SMP service.
+# Enable mcumgr/SMP messages over BLE SMP service
 CONFIG_MCUMGR_TRANSPORT_BT=y
-# Require authenticated BLE connection for mcumgr read/write operations.
+# Require authenticated BLE connection for mcumgr read/write operations
 CONFIG_MCUMGR_TRANSPORT_BT_PERM_RW_AUTHEN=y
-# Reassemble SMP packets fragmented over BLE.
+# Reassemble SMP packets fragmented over BLE
 CONFIG_MCUMGR_TRANSPORT_BT_REASSEMBLY=y
-# mcumgr transport receive buffer size for DFU image chunks.
+# mcumgr transport receive buffer size for DFU image chunks
 CONFIG_MCUMGR_TRANSPORT_NETBUF_SIZE=1024
 
 # CBOR (mcumgr/SMP/DFU command payload format)
@@ -168,21 +165,21 @@ CONFIG_MCUMGR_TRANSPORT_NETBUF_SIZE=1024
 CONFIG_ZCBOR_MAX_STR_LEN=512
 
 # mcumgr callbacks/hooks
-# Enable mcumgr management event notification hooks.
+# Enable mcumgr management event notification hooks
 CONFIG_MCUMGR_MGMT_NOTIFICATION_HOOKS=y
 # Enable image upload/DFU status hooks.
 CONFIG_MCUMGR_GRP_IMG_STATUS_HOOKS=y
-# Enable SMP command done/failed status hooks.
+# Enable SMP command done/failed status hooks
 CONFIG_MCUMGR_SMP_COMMAND_STATUS_HOOKS=y
 
 # mcumgr command groups
-# Enable image management group: upload, test, confirm, state.
+# Enable image management group: upload, test, confirm, state
 CONFIG_MCUMGR_GRP_IMG=y
-# Enable OS management group: reset and OS-related commands.
+# Enable OS management group: reset and OS-related commands
 CONFIG_MCUMGR_GRP_OS=y
 
 # MCUboot image handling
-# Enable image manager for MCUboot image state/verify/confirm operations.
+# Enable image manager for MCUboot image state/verify/confirm operations
 CONFIG_IMG_MANAGER=y
-# Write uploaded image data to flash as a stream.
-CONFIG_STREAM_FLASH=y
\ No newline at end of file
+# Write uploaded image data to flash as a stream
+CONFIG_STREAM_FLASH=y
diff --git a/src/command/handlers/cmd_sensor.c b/src/command/handlers/cmd_sensor.c
index 7f98820..e658fe6 100644
--- a/src/command/handlers/cmd_sensor.c
+++ b/src/command/handlers/cmd_sensor.c
@@ -24,7 +24,7 @@ int cmd_msn(const uint8_t *data, uint8_t data_len)
     int mv = battery_read_mv();
     if (mv < 0)
     {
-        mv = 0;
+        mv = 0xFFFF;
     }
 
     cmd_send_response_u16("rsn:", (uint16_t)mv);