diff --git a/build_static/app.js.gz b/build_static/app.js.gz
new file mode 100644
index 0000000..ba8b242
Binary files /dev/null and b/build_static/app.js.gz differ
diff --git a/build_static/styles.css b/build_static/styles.css
new file mode 100644
index 0000000..e3ecf1c
--- /dev/null
+++ b/build_static/styles.css
@@ -0,0 +1,37 @@
+/* General tab styles */
+.tabs {
+    display: flex;
+    justify-content: center;
+    margin-bottom: 20px;
+}
+
+.tab {
+    padding: 10px 20px;
+    margin: 0 10px;
+    cursor: pointer;
+    background-color: #f1f1f1;
+    border: 1px solid #ccc;
+    border-radius: 4px;
+    transition: background-color 0.3s ease;
+}
+
+.tab:hover {
+    background-color: #ddd;
+}
+
+.tab.active {
+    background-color: #ccc;
+}
+
+.tab-content {
+    display: flex;
+    justify-content: center;
+}
+
+.tab-pane {
+    display: none;
+}
+
+.tab-pane.active {
+    display: block;
+}
diff --git a/build_static/styles.css.gz b/build_static/styles.css.gz
new file mode 100644
index 0000000..009b842
Binary files /dev/null and b/build_static/styles.css.gz differ
diff --git a/db/tab.json b/db/tab.json
index aa03731..ffdc6a2 100644
--- a/db/tab.json
+++ b/db/tab.json
@@ -2,7 +2,7 @@
   "1": {
     "name": "default",
     "names": [
-      "1","2","3","4","5","6","7","8"
+      "a","b","c","d","e","f","g","h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", "1", "2", "3", "4", "5", "6", "7", "8", "9", "0"
     ],
     "presets": [
       [
diff --git a/flash.sh b/flash.sh
new file mode 100755
index 0000000..4025284
--- /dev/null
+++ b/flash.sh
@@ -0,0 +1,244 @@
+#!/usr/bin/env sh
+set -eu
+
+# Environment variables:
+#   PORT   - serial port (default: /dev/ttyUSB0)
+#   BAUD   - baud rate (default: 460800)
+#   FIRMWARE - local path to firmware .bin
+#   FW_URL  - URL to download firmware if FIRMWARE not provided or missing
+
+PORT=${PORT:-}
+BAUD=${BAUD:-460800}
+CHIP=${CHIP:-esp32} # esp32 | esp32c3
+
+# Map chip-specific settings
+ESPT_CHIP="$CHIP"
+FLASH_OFFSET=0x1000
+DEFAULT_DOWNLOAD_PAGE="https://micropython.org/download/ESP32/"
+BOARD_ID="ESP32_GENERIC"
+BOARD_PAGE="https://micropython.org/download/${BOARD_ID}/"
+case "$CHIP" in
+  esp32c3)
+    ESPT_CHIP="esp32c3"
+    FLASH_OFFSET=0x0
+    DEFAULT_DOWNLOAD_PAGE="https://micropython.org/download/ESP32C3/"
+    BOARD_ID="ESP32_GENERIC_C3"
+    BOARD_PAGE="https://micropython.org/download/${BOARD_ID}/"
+    ;;
+  esp32)
+    ESPT_CHIP="esp32"
+    FLASH_OFFSET=0x1000
+    DEFAULT_DOWNLOAD_PAGE="https://micropython.org/download/ESP32/"
+    BOARD_ID="ESP32_GENERIC"
+    BOARD_PAGE="https://micropython.org/download/${BOARD_ID}/"
+    ;;
+  *)
+    echo "Unsupported CHIP: $CHIP (supported: esp32, esp32c3)" >&2
+    exit 1
+    ;;
+esac
+
+# Download-only mode: fetch the appropriate firmware and exit
+if [ -n "${DOWNLOAD_ONLY:-}" ]; then
+  # Prefer resolving latest if nothing provided
+  if [ -z "${FIRMWARE:-}" ] && [ -z "${FW_URL:-}" ]; then
+    LATEST=1
+  fi
+  if ! resolve_firmware; then
+    echo "Failed to resolve firmware for CHIP=$CHIP" >&2
+    exit 1
+  fi
+  echo "$FIRMWARE"
+  exit 0
+fi
+
+# Helper: resolve the latest firmware URL for a given board pattern with multiple fallbacks
+resolve_latest_url() {
+  board_pattern="$1" # e.g., ESP32_GENERIC_C3-.*\.bin
+  # Candidate pages to try in order
+  pages="${BOARD_PAGE} ${DOWNLOAD_PAGE:-$DEFAULT_DOWNLOAD_PAGE} https://micropython.org/download/ https://micropython.org/resources/firmware/"
+  for page in $pages; do
+    echo "Trying to resolve latest from $page" >&2
+    html=$(curl -fsSL -H 'User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36' -e 'https://micropython.org/download/' "$page" || true)
+    [ -z "$html" ] && continue
+    # Prefer matching the board pattern
+    url=$(printf "%s" "$html" \
+      | sed -n 's/.*href=\"\([^\"]*\.bin\)\".*/\1/p' \
+      | grep -E "$board_pattern" \
+      | head -n1)
+    if [ -n "$url" ]; then
+      case "$url" in
+        http*) echo "$url"; return 0 ;;
+        /*) echo "https://micropython.org$url"; return 0 ;;
+        *) echo "$page$url"; return 0 ;;
+      esac
+    fi
+  done
+  return 1
+}
+
+# If LATEST is set and neither FIRMWARE nor FW_URL are provided, auto-detect latest URL
+if [ -n "${LATEST:-}" ] && [ -z "${FIRMWARE:-}" ] && [ -z "${FW_URL:-}" ]; then
+  # Default board identifiers for each chip
+  case "$CHIP" in
+    esp32c3) BOARD_ID="ESP32_GENERIC_C3" ;;
+    esp32) BOARD_ID="ESP32_GENERIC" ;;
+    *) BOARD_ID="ESP32_GENERIC" ;;
+  esac
+  pattern="${BOARD_ID}-.*\\.bin"
+  echo "Resolving latest firmware for $BOARD_ID"
+  if FW_URL=$(resolve_latest_url "$pattern"); then
+    export FW_URL
+    echo "Latest firmware resolved to: $FW_URL"
+  else
+    echo "Failed to resolve latest firmware for pattern $pattern" >&2
+    exit 1
+  fi
+fi
+
+# Resolve firmware path, downloading if needed
+resolve_firmware() {
+  if [ -z "${FIRMWARE:-}" ]; then
+    if [ -n "${FW_URL:-}" ] || [ -n "${LATEST:-}" ]; then
+      # If FW_URL still unset, resolve latest using board-specific pattern
+      if [ -z "${FW_URL:-}" ]; then
+        case "$CHIP" in
+          esp32c3) BOARD_ID="ESP32_GENERIC_C3" ;;
+          esp32) BOARD_ID="ESP32_GENERIC" ;;
+          *) BOARD_ID="ESP32_GENERIC" ;;
+        esac
+        pattern="${BOARD_ID}-.*\\.bin"
+        echo "Resolving latest firmware for $BOARD_ID"
+        if ! FW_URL=$(resolve_latest_url "$pattern"); then
+          echo "Failed to resolve latest firmware for pattern $pattern" >&2
+          exit 1
+        fi
+      fi
+      mkdir -p .cache
+      FIRMWARE=".cache/$(basename "$FW_URL")"
+      if [ ! -f "$FIRMWARE" ]; then
+        echo "Downloading firmware from $FW_URL to $FIRMWARE"
+        curl -L --fail -o "$FIRMWARE" "$FW_URL"
+      else
+        echo "Firmware already downloaded at $FIRMWARE"
+      fi
+    else
+      # Default fallback: fetch latest using board-specific pattern
+      case "$CHIP" in
+        esp32c3) BOARD_ID="ESP32_GENERIC_C3" ;;
+        esp32) BOARD_ID="ESP32_GENERIC" ;;
+        *) BOARD_ID="ESP32_GENERIC" ;;
+      esac
+      pattern="${BOARD_ID}-.*\\.bin"
+      echo "No FIRMWARE or FW_URL specified. Auto-fetching latest for $BOARD_ID"
+      if ! FW_URL=$(resolve_latest_url "$pattern"); then
+        echo "Failed to resolve latest firmware for pattern $pattern" >&2
+        exit 1
+      fi
+      mkdir -p .cache
+      FIRMWARE=".cache/$(basename "$FW_URL")"
+      if [ ! -f "$FIRMWARE" ]; then
+        echo "Downloading firmware from $FW_URL to $FIRMWARE"
+        curl -L --fail -o "$FIRMWARE" "$FW_URL"
+      else
+        echo "Firmware already downloaded at $FIRMWARE"
+      fi
+    fi
+  else
+    if [ ! -f "$FIRMWARE" ]; then
+      if [ -n "${FW_URL:-}" ]; then
+        mkdir -p "$(dirname "$FIRMWARE")"
+        echo "Firmware not found at $FIRMWARE. Downloading from $FW_URL"
+        curl -L --fail -o "$FIRMWARE" "$FW_URL"
+      else
+        echo "Firmware file not found: $FIRMWARE. Provide FW_URL to download automatically." >&2
+        exit 1
+      fi
+    fi
+  fi
+}
+
+# Auto-detect PORT if not specified
+if [ -z "$PORT" ]; then
+  candidates="$(ls /dev/tty/ACM* /dev/tty/USB* 2>/dev/null || true)"
+  # Some systems expose without /dev/tty/ prefix patterns; try common Linux paths
+  [ -z "$candidates" ] && candidates="$(ls /dev/ttyACM* /dev/ttyUSB* 2>/dev/null || true)"
+  # Prefer ACM (often for C3) then USB
+  PORT=$(printf "%s\n" $candidates | grep -E "/dev/ttyACM[0-9]+" | head -n1 || true)
+  [ -z "$PORT" ] && PORT=$(printf "%s\n" $candidates | grep -E "/dev/ttyUSB[0-9]+" | head -n1 || true)
+  if [ -z "$PORT" ]; then
+    echo "No serial port detected. Connect the board and set PORT=/dev/ttyACM0 (or /dev/ttyUSB0)." >&2
+    exit 1
+  fi
+  echo "Auto-detected PORT=$PORT"
+fi
+
+# Preflight: ensure port exists
+if [ ! -e "$PORT" ]; then
+  echo "Port $PORT does not exist. Detected candidates:" >&2
+  ls /dev/ttyACM* /dev/ttyUSB* 2>/dev/null || true
+  exit 1
+fi
+
+ESPL="python -m esptool"
+
+detect_chip() {
+  # Try to detect actual connected chip using esptool and override if needed
+  out=$($ESPL --port "$PORT" --baud "$BAUD" chip_id 2>&1 || true)
+  case "$out" in
+    *"ESP32-C3"*) DETECTED_CHIP=esp32c3 ;;
+    *"ESP32"*) DETECTED_CHIP=esp32 ;;
+    *) DETECTED_CHIP="" ;;
+  esac
+  if [ -n "$DETECTED_CHIP" ] && [ "$DETECTED_CHIP" != "$ESPT_CHIP" ]; then
+    echo "Detected chip $DETECTED_CHIP differs from requested $ESPT_CHIP. Using detected chip."
+    ESPT_CHIP="$DETECTED_CHIP"
+    case "$ESPT_CHIP" in
+      esp32c3) FLASH_OFFSET=0x0 ;;
+      esp32) FLASH_OFFSET=0x1000 ;;
+    esac
+  fi
+}
+
+detect_chip
+
+# Now that we know the actual chip, resolve the correct firmware for it
+resolve_firmware
+
+# Validate firmware matches detected chip; if not, auto-correct by fetching the right image
+EXPECTED_BOARD_ID="ESP32_GENERIC"
+case "$ESPT_CHIP" in
+  esp32c3) EXPECTED_BOARD_ID="ESP32_GENERIC_C3" ;;
+  esp32) EXPECTED_BOARD_ID="ESP32_GENERIC" ;;
+
+esac
+
+FW_BASENAME="$(basename "$FIRMWARE")"
+case "$FW_BASENAME" in
+  ${EXPECTED_BOARD_ID}-*.bin) : ;; # ok
+  *)
+    echo "Firmware $FW_BASENAME does not match detected chip ($ESPT_CHIP). Fetching correct image for $EXPECTED_BOARD_ID..."
+    pattern="${EXPECTED_BOARD_ID}-.*\\.bin"
+    if ! FW_URL=$(resolve_latest_url "$pattern"); then
+      echo "Failed to resolve a firmware matching $EXPECTED_BOARD_ID" >&2
+      exit 1
+    fi
+    mkdir -p .cache
+    FIRMWARE=".cache/$(basename "$FW_URL")"
+    if [ ! -f "$FIRMWARE" ]; then
+      echo "Downloading firmware from $FW_URL to $FIRMWARE"
+      curl -L --fail -o "$FIRMWARE" "$FW_URL"
+    else
+      echo "Firmware already downloaded at $FIRMWARE"
+    fi
+    ;;
+esac
+
+$ESPL --chip "$ESPT_CHIP" --port "$PORT" --baud "$BAUD" erase_flash
+
+echo "Writing firmware $FIRMWARE to $FLASH_OFFSET..."
+$ESPL --chip "$ESPT_CHIP" --port "$PORT" --baud "$BAUD" write_flash -z "$FLASH_OFFSET" "$FIRMWARE"
+
+echo "Done."
+
+
diff --git a/src/controllers/preset.py b/src/controllers/preset.py
index 059b83e..51e576f 100644
--- a/src/controllers/preset.py
+++ b/src/controllers/preset.py
@@ -3,7 +3,7 @@ from microdot.session import with_session
 from models.preset import Preset
 from models.profile import Profile
 from models.espnow import ESPNow
-from util.espnow_message import build_message, build_preset_dict
+from util.espnow_message import build_message, build_preset_dict, ESPNOW_MAX_PAYLOAD_BYTES
 import asyncio
 import json
 
@@ -161,7 +161,7 @@ async def send_presets(request, session):
         msg = build_message(presets=chunk_presets, save=save_flag, default=default_id)
         await esp.send(msg)
 
-    MAX_BYTES = 240
+    MAX_BYTES = ESPNOW_MAX_PAYLOAD_BYTES
     SEND_DELAY_MS = 100
     entries = list(presets_by_name.items())
     total_presets = len(entries)
diff --git a/src/main.py b/src/main.py
index f6d95d6..18e2e4c 100644
--- a/src/main.py
+++ b/src/main.py
@@ -19,6 +19,7 @@ import controllers.scene as scene
 import controllers.pattern as pattern
 import controllers.settings as settings_controller
 from models.espnow import ESPNow
+from util.espnow_message import split_espnow_message
 
 
 async def main(port=80):
@@ -98,9 +99,17 @@ async def main(port=80):
                 except Exception:
                     print("WS received raw:", data)
 
-                # Forward raw JSON payload over ESPNow to configured peers
+                # Forward JSON over ESPNow; split into multiple frames if > 250 bytes
                 try:
-                    await esp.send(data)
+                    try:
+                        parsed = json.loads(data)
+                        chunks = split_espnow_message(parsed)
+                    except (json.JSONDecodeError, ValueError):
+                        chunks = [data]
+                    for i, chunk in enumerate(chunks):
+                        if i > 0:
+                            await asyncio.sleep_ms(100)
+                        await esp.send(chunk)
                 except Exception:
                     try:
                         await ws.send(json.dumps({"error": "ESP-NOW send failed"}))
diff --git a/src/util/espnow_message.py b/src/util/espnow_message.py
index a377e2b..86cc09b 100644
--- a/src/util/espnow_message.py
+++ b/src/util/espnow_message.py
@@ -2,10 +2,15 @@
 ESPNow message builder utility for LED driver communication.
 
 This module provides utilities to build ESPNow messages according to the API specification.
+ESPNow has a 250-byte payload limit; messages larger than that must be split into multiple
+frames.
 """
 
 import json
 
+# ESPNow payload limit (bytes). Messages larger than this must be split.
+ESPNOW_MAX_PAYLOAD_BYTES = 240
+
 
 def build_message(presets=None, select=None, save=False, default=None):
     """
@@ -54,6 +59,82 @@ def build_message(presets=None, select=None, save=False, default=None):
     return json.dumps(message)
 
 
+def split_espnow_message(msg_dict, max_bytes=None):
+    """
+    Split a message dict into one or more JSON strings each within ESPNow payload limit.
+    If the message fits in max_bytes, returns a single-element list. Otherwise splits
+    "select" and/or "presets" into multiple messages (other keys like v, b, default, save
+    are included only in the first message).
+
+    Args:
+        msg_dict: Full message as a dict (e.g. from json.loads).
+        max_bytes: Max payload size in bytes (default ESPNOW_MAX_PAYLOAD_BYTES).
+
+    Returns:
+        List of JSON strings, each <= max_bytes, to send in order.
+    """
+    if max_bytes is None:
+        max_bytes = ESPNOW_MAX_PAYLOAD_BYTES
+
+    single = json.dumps(msg_dict)
+    if len(single) <= max_bytes:
+        return [single]
+
+    # Keys to attach only to the first message we emit
+    first_only = {k: msg_dict[k] for k in ("b", "default", "save") if k in msg_dict}
+    out = []
+
+    def emit(chunk_dict, is_first):
+        m = {"v": msg_dict.get("v", "1")}
+        if is_first and first_only:
+            m.update(first_only)
+        m.update(chunk_dict)
+        s = json.dumps(m)
+        if len(s) > max_bytes:
+            raise ValueError(f"Chunk still too large ({len(s)} > {max_bytes})")
+        out.append(s)
+
+    def chunk_dict(key, items_dict):
+        if not items_dict:
+            return
+        items = list(items_dict.items())
+        i = 0
+        first = True
+        while i < len(items):
+            chunk = {}
+            while i < len(items):
+                k, v = items[i]
+                trial = dict(chunk)
+                trial[k] = v
+                trial_msg = {"v": msg_dict.get("v", "1"), key: trial}
+                if first_only and first:
+                    trial_msg.update(first_only)
+                if len(json.dumps(trial_msg)) <= max_bytes:
+                    chunk[k] = v
+                    i += 1
+                else:
+                    if not chunk:
+                        # Single entry too large; send as-is and hope receiver accepts
+                        chunk[k] = v
+                        i += 1
+                    break
+            if chunk:
+                emit({key: chunk}, first)
+                first = False
+            if not chunk:
+                break
+
+    if "select" in msg_dict:
+        chunk_dict("select", msg_dict["select"])
+    if "presets" in msg_dict:
+        chunk_dict("presets", msg_dict["presets"])
+
+    if not out:
+        # Fallback: emit one message even if over limit (receiver may reject)
+        out = [single]
+    return out
+
+
 def build_select_message(device_name, preset_name, step=None):
     """
     Build a select message for a single device.