diff --git a/lib/shared/crc32.ts b/lib/shared/crc32.ts
index 95da4f9..2117247 100644
--- a/lib/shared/crc32.ts
+++ b/lib/shared/crc32.ts
@@ -1,6 +1,6 @@
 /**
  * Pre-computed CRC32 lookup table using reflected polynomial 0xEDB88320.
- * Compatible with zlib.crc32() used by ESP-IDF.
+ * Compatible with esp_rom_crc32_le(0xFFFFFFFF, ...) used by ESP-IDF NVS/OTA.
  */
 const CRC32_TABLE: Uint32Array = (() => {
   const table = new Uint32Array(256);
@@ -16,7 +16,7 @@ const CRC32_TABLE: Uint32Array = (() => {
 
 /** Compute CRC32 of a Uint8Array. Returns unsigned 32-bit integer. */
 export function crc32(data: Uint8Array): number {
-  let crc = 0xFFFFFFFF;
+  let crc = 0x00000000;
   for (let i = 0; i < data.length; i++) {
     crc = (crc >>> 8) ^ CRC32_TABLE[(crc ^ data[i]) & 0xFF];
   }