diff --git a/targets/stm32l432/src/nfc.c b/targets/stm32l432/src/nfc.c
index 0b4cf5c..61d8845 100644
--- a/targets/stm32l432/src/nfc.c
+++ b/targets/stm32l432/src/nfc.c
@@ -508,6 +508,8 @@ void nfc_process_block(uint8_t * buf, int len)
         {
             nfc_write_frame(buf, 1);
             printf1(TAG_NFC, "NFC_CMD_SBLOCK, DESELECTED\r\n");
+            ams_wait_for_tx(2);
+            ams_write_command(AMS_CMD_SLEEP);
             nfc_state_init();
         }
         else
diff --git a/targets/stm32l432/src/nfc.h b/targets/stm32l432/src/nfc.h
index b425b28..ced5975 100644
--- a/targets/stm32l432/src/nfc.h
+++ b/targets/stm32l432/src/nfc.h
@@ -35,8 +35,8 @@ typedef struct
 #define NFC_CMD_SBLOCK                0xc0
 #define IS_SBLOCK(x)                  ( (((x) & 0xc0) == NFC_CMD_SBLOCK) && (((x) & 0x02) == 0x02) )
 
-#define NFC_SBLOCK_DESELECT           0x32
-#define NFC_SBLOCK_WTX                0xf2
+#define NFC_SBLOCK_DESELECT           0x30
+#define NFC_SBLOCK_WTX                0x30
 
 #define AID_NDEF_TYPE_4               "\xD2\x76\x00\x00\x85\x01\x01"
 #define AID_NDEF_MIFARE_TYPE_4        "\xD2\x76\x00\x00\x85\x01\x00"
@@ -46,6 +46,7 @@ typedef struct
 
 typedef enum
 {
+    APP_NOTHING = 0,
     APP_NDEF_TYPE_4 = 1,
     APP_MIFARE_TYPE_4,
     APP_CAPABILITY_CONTAINER,