diff --git a/lib/app-image/constants.ts b/lib/app-image/constants.ts
index f85cabe..95126a1 100644
--- a/lib/app-image/constants.ts
+++ b/lib/app-image/constants.ts
@@ -16,12 +16,6 @@ export const APP_DESC_MAGIC = 0xABCD5432;
 /** Size of esp_app_desc_t structure */
 export const APP_DESC_SIZE = 256;
 
-/** Offset of custom app desc within first segment data (immediately after esp_app_desc_t) */
-export const CUSTOM_DESC_OFFSET_IN_SEGMENT = APP_DESC_SIZE; // 256
-
-/** How many raw bytes to extract for the custom app desc dump */
-export const CUSTOM_DESC_DUMP_SIZE = 64;
-
 /** Chip ID to human-readable name */
 export const CHIP_ID_NAMES: Record<number, string> = {
   0x0000: 'ESP32',
diff --git a/lib/app-image/parser.ts b/lib/app-image/parser.ts
index 8604822..a401740 100644
--- a/lib/app-image/parser.ts
+++ b/lib/app-image/parser.ts
@@ -5,7 +5,6 @@ import type {
 import {
   IMAGE_MAGIC, IMAGE_HEADER_SIZE, EXTENDED_HEADER_SIZE,
   SEGMENT_HEADER_SIZE, APP_DESC_MAGIC, APP_DESC_SIZE, CHIP_ID_NAMES,
-  CUSTOM_DESC_OFFSET_IN_SEGMENT, CUSTOM_DESC_DUMP_SIZE,
 } from './constants';
 
 /**
@@ -94,21 +93,11 @@ export function parseAppImage(data: Uint8Array): AppImageInfo {
     }
   }
 
-  // ── Custom App Description — fixed offset in first segment ──
-  let customDescRawBytes: Uint8Array | null = null;
-  if (segDataOffsets.length > 0) {
-    const customOff = segDataOffsets[0] + CUSTOM_DESC_OFFSET_IN_SEGMENT;
-    if (customOff + CUSTOM_DESC_DUMP_SIZE <= data.length) {
-      customDescRawBytes = new Uint8Array(data.subarray(customOff, customOff + CUSTOM_DESC_DUMP_SIZE));
-    }
-  }
-
   return {
     header,
     extendedHeader,
     segments,
     appDescription,
-    customDescRawBytes,
     valid: segments.length === segmentCount, // false if image was truncated mid-segment
     chipName: CHIP_ID_NAMES[chipId] ?? `Unknown (0x${chipId.toString(16)})`,
   };
diff --git a/lib/app-image/types.ts b/lib/app-image/types.ts
index 4367269..274cc9d 100644
--- a/lib/app-image/types.ts
+++ b/lib/app-image/types.ts
@@ -63,8 +63,6 @@ export interface AppImageInfo {
   extendedHeader: ExtendedHeader;
   segments: SegmentHeader[];
   appDescription: AppDescription | null;
-  /** Raw bytes at the custom app desc location (null if first segment too short) */
-  customDescRawBytes: Uint8Array | null;
   valid: boolean;
   chipName: string;
 }