diff --git a/usrc/subboards/subboard100_idcard_reader/eeprom_service.cpp b/usrc/subboards/subboard100_idcard_reader/eeprom_service.cpp
index ba01b6d..2d12cfa 100644
--- a/usrc/subboards/subboard100_idcard_reader/eeprom_service.cpp
+++ b/usrc/subboards/subboard100_idcard_reader/eeprom_service.cpp
@@ -12,6 +12,9 @@ using namespace iflytop;
 #define SECTOR_NUM  (2 * 8)
 #define MAX_SIZE    (SECTOR_SIZE * SECTOR_NUM)  // 2k
 
+#define READ_SECTOR_SIZE (32)
+#define READ_SECTOR_NUM  (2 * 8 * 4)
+
 #define TAG "EEPROMService"
 
 /*******************************************************************************
@@ -164,17 +167,18 @@ void EEPROMService::detect_online() {
 int32_t EEPROMService::a8000_idcard_reader_read_raw(int32_t index, uint8_t* data, int32_t* len) {
   zlock_guard guard(m_mutex);
   if (!m_nowonline) return err::kdevice_offline;
-  if (*len < SECTOR_SIZE) return err::kbuffer_not_enough;
-  ZLOGI(TAG, "read: %d", index);
-
-  uint16_t add = index * SECTOR_SIZE;
-  *len         = SECTOR_SIZE;
+  if (*len < READ_SECTOR_SIZE) return err::kbuffer_not_enough;
+  int readlen = *len;
 
-  if (add >= MAX_SIZE) {
-    *len = 0;
+  uint16_t add = index * readlen;
+  *len         = readlen;
+  if (*len + add > MAX_SIZE) {
+    *len = MAX_SIZE - add;
+  }
+  if (*len <= 0) {
     return 0;
   }
-
+  ZLOGI(TAG, "read: %d", index);
   memcpy(data, m_idcardcache + add, *len);
   return 0;
 }
diff --git a/usrc/version.h b/usrc/version.h
index 88f9da9..a3cc52b 100644
--- a/usrc/version.h
+++ b/usrc/version.h
@@ -1,2 +1,2 @@
 #pragma once
-#define APP_VERSION           1103
+#define APP_VERSION           1104