diff --git a/fido2/crypto.h b/fido2/crypto.h
index 497ebf5..685908e 100644
--- a/fido2/crypto.h
+++ b/fido2/crypto.h
@@ -49,8 +49,8 @@ void generate_private_key(uint8_t * data, int len, uint8_t * data2, int len2, ui
 void crypto_ecc256_make_key_pair(uint8_t * pubkey, uint8_t * privkey);
 void crypto_ecc256_shared_secret(const uint8_t * pubkey, const uint8_t * privkey, uint8_t * shared_secret);
 
-#define CRYPTO_TRANSPORT_KEY            NULL
-#define CRYPTO_MASTER_KEY               NULL
+#define CRYPTO_TRANSPORT_KEY            ((uint8_t*)1)
+#define CRYPTO_MASTER_KEY               ((uint8_t*)0)
 
 void crypto_aes256_init(uint8_t * key, uint8_t * nonce);
 void crypto_aes256_reset_iv(uint8_t * nonce);
@@ -66,6 +66,7 @@ void crypto_load_master_secret(uint8_t * key);
 extern const uint8_t attestation_cert_der[];
 extern const uint16_t attestation_cert_der_size;
 
-
+extern const uint8_t attestation_key[];
+extern const uint16_t attestation_key_size;
 
 #endif
diff --git a/fido2/ctap.c b/fido2/ctap.c
index c3b4a4c..ba641e5 100644
--- a/fido2/ctap.c
+++ b/fido2/ctap.c
@@ -269,12 +269,12 @@ static int ctap_generate_cose_key(CborEncoder * cose_key, uint8_t * hmac_input,
 void make_auth_tag(uint8_t * nonce, CTAP_userEntity * user, uint32_t count, uint8_t * tag)
 {
     uint8_t hashbuf[32];
-    crypto_sha256_hmac_init(NULL, 0, hashbuf);
+    crypto_sha256_hmac_init(CRYPTO_TRANSPORT_KEY, 0, hashbuf);
     crypto_sha256_update(nonce, CREDENTIAL_NONCE_SIZE);
     crypto_sha256_update(user->id, user->id_size);
     crypto_sha256_update(user->name, strnlen((const char*)user->name, USER_NAME_LIMIT));
     crypto_sha256_update((uint8_t*)&count, 4);
-    crypto_sha256_hmac_final(NULL,0,hashbuf);
+    crypto_sha256_hmac_final(CRYPTO_TRANSPORT_KEY,0,hashbuf);
 
     memmove(tag, hashbuf, CREDENTIAL_TAG_SIZE);
 }
diff --git a/fido2/device.h b/fido2/device.h
index adbc842..e750568 100644
--- a/fido2/device.h
+++ b/fido2/device.h
@@ -28,6 +28,8 @@ void device_init();
 
 uint32_t millis();
 
+void delay(uint32_t ms);
+
 // HID message size in bytes
 #define HID_MESSAGE_SIZE        64
 
diff --git a/fido2/main.c b/fido2/main.c
index 797c856..8c2cdb3 100644
--- a/fido2/main.c
+++ b/fido2/main.c
@@ -36,12 +36,8 @@
 
 int main(int argc, char * argv[])
 {
-    int count = 0;
-    uint32_t t1 = 0;
-    uint32_t t2 = 0;
-    uint32_t accum = 0;
-    uint32_t dt = 0;
     uint8_t hidmsg[64];
+    uint32_t t1 = 0;
 
     set_logging_mask(
             /*0*/
@@ -51,11 +47,11 @@ int main(int argc, char * argv[])
             // TAG_WALLET |
             TAG_STOR |
             // TAG_CP |
-            TAG_CTAP|
+            // TAG_CTAP|
            // TAG_HID|
             /*TAG_U2F|*/
             // TAG_PARSE |
-           //TAG_TIME|
+           // TAG_TIME|
             // TAG_DUMP|
             TAG_GREEN|
             TAG_RED|
@@ -89,24 +85,18 @@ int main(int argc, char * argv[])
 
         if (usbhid_recv(hidmsg) > 0)
         {
-            t2 = millis();
             ctaphid_handle_packet(hidmsg);
-            accum += millis() - t2;
-            // printf1(TAG_TIME,"accum: %d\n", (uint32_t)accum);
-            // printf1(TAG_TIME,"dt: %d\n", t2 - dt);
-            dt = t2;
             memset(hidmsg, 0, sizeof(hidmsg));
         }
         else
         {
-            /*main_loop_delay();*/
         }
         ctaphid_check_timeouts();
     }
 
     // Should never get here
     usbhid_close();
-    printf("done\n");
+    printf1(TAG_GREEN, "done\n");
     return 0;
 }
 
diff --git a/fido2/test_power.c b/fido2/test_power.c
index 607e732..38e2b4f 100644
--- a/fido2/test_power.c
+++ b/fido2/test_power.c
@@ -124,7 +124,7 @@ int main(int argc, char * argv[])
 
     // Should never get here
     usbhid_close();
-    printf("done\n");
+    printf1(TAG_GREEN, "done\n");
     return 0;
 }
 
diff --git a/targets/stm32l442/Makefile b/targets/stm32l442/Makefile
index 7dd2ea3..e8f209c 100644
--- a/targets/stm32l442/Makefile
+++ b/targets/stm32l442/Makefile
@@ -42,7 +42,7 @@ CHIP=STM32L442xx
 DEFINES = -D$(CHIP) -DAES256=1  -DUSE_FULL_LL_DRIVER
 # DEFINES += -DTEST_SOLO_STM32 -DTEST -DTEST_FIFO=1
 
-CFLAGS=$(INC) -c $(DEFINES)  -Os  -Wall -fdata-sections -ffunction-sections $(HW)
+CFLAGS=$(INC) -c $(DEFINES)   -Wall -fdata-sections -ffunction-sections $(HW)
 LDFLAGS_LIB=$(HW) $(SEARCH) -specs=nano.specs  -specs=nosys.specs  -Wl,--gc-sections -u _printf_float -lnosys
 LDFLAGS=$(HW) $(LDFLAGS_LIB) -T$(LDSCRIPT) -Wl,-Map=$(TARGET).map,--cref -ltinycbor
 
@@ -53,11 +53,13 @@ all: $(TARGET).elf
 	$(SZ) $^
 
 %.o: %.c
-	$(CC) $^ $(HW) $(CFLAGS) -o $@
+	$(CC) $^ $(HW)  -Os $(CFLAGS) -o $@
 
+../../crypto/micro-ecc/uECC.o: ../../crypto/micro-ecc/uECC.c
+	$(CC) $^ $(HW)  -O3 $(CFLAGS) -o $@
 
 %.o: %.s
-	$(CC) $^ $(HW) $(CFLAGS) -o $@
+	$(CC) $^ $(HW)  -Os $(CFLAGS) -o $@
 
 %.elf: $(OBJ)
 	$(CC) $^ $(HW) $(LDFLAGS) -o $@
@@ -69,8 +71,9 @@ clean:
 	rm -f *.o src/*.o src/*.elf *.elf *.hex $(OBJ)
 
 flash: $(TARGET).hex
-	STM32_Programmer_CLI -c port=SWD -halt -e all
+	STM32_Programmer_CLI -c port=SWD -halt -e all --readunprotect
 	STM32_Programmer_CLI -c port=SWD -halt  -d $(TARGET).hex -rst
+	STM32_Programmer_CLI -c port=SWD  -rst
 	sleep 0.5
 	python dfuse-tool/dfuse-tool.py --leave
 
diff --git a/targets/stm32l442/src/app.h b/targets/stm32l442/src/app.h
index 0db87d3..6a31791 100644
--- a/targets/stm32l442/src/app.h
+++ b/targets/stm32l442/src/app.h
@@ -4,15 +4,10 @@
 
 #define DEBUG_UART      USART1
 
-
-
-
-#define DEBUG_LEVEL 1
+#define DEBUG_LEVEL     1
 
 #define NON_BLOCK_PRINTING 0
 
-//#define PRINTING_USE_VCOM
-
 //#define USING_DEV_BOARD
 
 //#define ENABLE_U2F_EXTENSIONS
@@ -35,6 +30,7 @@ void hw_init(void);
 #define SOLO_BUTTON_PORT        GPIOA
 #define SOLO_BUTTON_PIN         LL_GPIO_PIN_0
 
-#define SKIP_BUTTON_CHECK       1
+#define SKIP_BUTTON_CHECK_WITH_DELAY        1
+#define SKIP_BUTTON_CHECK_FAST              0
 
 #endif
diff --git a/targets/stm32l442/src/crypto.c b/targets/stm32l442/src/crypto.c
index c22067b..70cd626 100644
--- a/targets/stm32l442/src/crypto.c
+++ b/targets/stm32l442/src/crypto.c
@@ -19,6 +19,7 @@
 #include "ctap.h"
 #include "device.h"
 #include "app.h"
+#include "log.h"
 
 
 typedef enum
@@ -39,14 +40,6 @@ typedef enum
 } mbedtls_ecp_group_id;
 
 
-
-const uint8_t attestation_cert_der[];
-const uint16_t attestation_cert_der_size;
-const uint8_t attestation_key[];
-const uint16_t attestation_key_size;
-
-
-
 static SHA256_CTX sha256_ctx;
 static const struct uECC_Curve_t * _es256_curve = NULL;
 static const uint8_t * _signing_key = NULL;
@@ -105,10 +98,15 @@ void crypto_sha256_hmac_init(uint8_t * key, uint32_t klen, uint8_t * hmac)
         key = master_secret;
         klen = sizeof(master_secret)/2;
     }
+    else if (key == CRYPTO_TRANSPORT_KEY)
+    {
+        key = transport_secret;
+        klen = 32;
+    }
 
     if(klen > 64)
     {
-        printf("Error, key size must be <= 64\n");
+        printf2(TAG_ERR, "Error, key size must be <= 64\n");
         exit(1);
     }
 
@@ -138,7 +136,7 @@ void crypto_sha256_hmac_final(uint8_t * key, uint32_t klen, uint8_t * hmac)
 
     if(klen > 64)
     {
-        printf("Error, key size must be <= 64\n");
+        printf2(TAG_ERR, "Error, key size must be <= 64\n");
         exit(1);
     }
     memmove(buf, key, klen);
@@ -172,7 +170,7 @@ void crypto_ecc256_sign(uint8_t * data, int len, uint8_t * sig)
 {
     if ( uECC_sign(_signing_key, data, len, sig, _es256_curve) == 0)
     {
-        printf("error, uECC failed\n");
+        printf2(TAG_ERR, "error, uECC failed\n");
         exit(1);
     }
 }
@@ -209,19 +207,19 @@ void crypto_ecdsa_sign(uint8_t * data, int len, uint8_t * sig, int MBEDTLS_ECP_I
             if (_key_len != 32)  goto fail;
             break;
         default:
-            printf("error, invalid ECDSA alg specifier\n");
+            printf2(TAG_ERR, "error, invalid ECDSA alg specifier\n");
             exit(1);
     }
 
     if ( uECC_sign(_signing_key, data, len, sig, curve) == 0)
     {
-        printf("error, uECC failed\n");
+        printf2(TAG_ERR, "error, uECC failed\n");
         exit(1);
     }
     return;
 
 fail:
-    printf("error, invalid key length\n");
+    printf2(TAG_ERR, "error, invalid key length\n");
     exit(1);
 
 }
@@ -261,7 +259,7 @@ void crypto_ecc256_make_key_pair(uint8_t * pubkey, uint8_t * privkey)
 {
     if (uECC_make_key(pubkey, privkey, _es256_curve) != 1)
     {
-        printf("Error, uECC_make_key failed\n");
+        printf2(TAG_ERR, "Error, uECC_make_key failed\n");
         exit(1);
     }
 }
@@ -270,7 +268,7 @@ void crypto_ecc256_shared_secret(const uint8_t * pubkey, const uint8_t * privkey
 {
     if (uECC_shared_secret(pubkey, privkey, shared_secret, _es256_curve) != 1)
     {
-        printf("Error, uECC_shared_secret failed\n");
+        printf2(TAG_ERR, "Error, uECC_shared_secret failed\n");
         exit(1);
     }
 
diff --git a/targets/stm32l442/src/device.c b/targets/stm32l442/src/device.c
index f4ecb7f..2033b47 100644
--- a/targets/stm32l442/src/device.c
+++ b/targets/stm32l442/src/device.c
@@ -95,6 +95,7 @@ void device_init()
     hw_init();
     LL_GPIO_SetPinMode(SOLO_BUTTON_PORT,SOLO_BUTTON_PIN,LL_GPIO_MODE_INPUT);
     LL_GPIO_SetPinPull(SOLO_BUTTON_PORT,SOLO_BUTTON_PIN,LL_GPIO_PULL_UP);
+    flash_option_bytes_init(0);
 
     printf1(TAG_GEN,"hello solo\r\n");
 }
@@ -337,9 +338,8 @@ static int handle_packets()
 
 int ctap_user_presence_test()
 {
-    int oldstatus = __device_status;
     int ret;
-#if SKIP_BUTTON_CHECK
+#if SKIP_BUTTON_CHECK_WITH_DELAY
     int i=500;
     while(i--)
     {
@@ -348,17 +348,15 @@ int ctap_user_presence_test()
         if (ret) return ret;
     }
     goto done;
+#elif SKIP_BUTTON_CHECK_FAST
+    delay(2);
+    ret = handle_packets();
+    if (ret) return ret;
+    goto done;
 #endif
-
     uint32_t t1 = millis();
     led_rgb(0xff3520);
 
-#if USE_BUTTON_DELAY
-    delay(3000);
-    led_rgb(0x001040);
-    delay(50);
-    goto done;
-#endif
 while (IS_BUTTON_PRESSED())
 {
     if (t1 + 5000 < millis())
diff --git a/targets/stm32l442/src/fifo.c b/targets/stm32l442/src/fifo.c
index cd13348..645c28b 100644
--- a/targets/stm32l442/src/fifo.c
+++ b/targets/stm32l442/src/fifo.c
@@ -4,7 +4,7 @@
 #include "fifo.h"
 
 
-FIFO_CREATE(debug,1024,1)
+FIFO_CREATE(debug,4096,1)
 
 FIFO_CREATE(hidmsg,100,64)
 
diff --git a/targets/stm32l442/src/flash.c b/targets/stm32l442/src/flash.c
index d87a002..1b09d66 100644
--- a/targets/stm32l442/src/flash.c
+++ b/targets/stm32l442/src/flash.c
@@ -6,6 +6,7 @@
 #include "app.h"
 #include "flash.h"
 #include "log.h"
+#include "device.h"
 
 static void flash_unlock()
 {
@@ -15,13 +16,57 @@ static void flash_unlock()
         FLASH->KEYR = 0xCDEF89AB;
     }
 }
+
+// Locks flash and turns off DFU
+void flash_option_bytes_init(int boot_from_dfu)
+{
+#if DEBUG_LEVEL
+    uint32_t val = 0xfffff8aa;
+#else
+    uint32_t val = 0xfffff8b9;
+#endif
+    if (!boot_from_dfu)
+    {
+        val &= ~(1<<26); // nSWBOOT0 = 0  (boot from nBoot0)
+    }
+    val &= ~(1<<25); // SRAM2_RST = 1 (erase sram on reset)
+    val &= ~(1<<24); // SRAM2_PE = 1 (parity check en)
+
+    if (FLASH->OPTR == val)
+    {
+        return;
+    }
+
+    __disable_irq();
+    while (FLASH->SR & (1<<16))
+        ;
+    flash_unlock();
+    if (FLASH->CR & (1<<30))
+    {
+        FLASH->OPTKEYR = 0x08192A3B;
+        FLASH->OPTKEYR = 0x4C5D6E7F;
+    }
+
+    FLASH->OPTR =val;
+    FLASH->CR |= (1<<17);
+
+    while (FLASH->SR & (1<<16))
+        ;
+
+    flash_lock();
+
+    __enable_irq();
+}
+
 void flash_erase_page(uint8_t page)
 {
     __disable_irq();
-    flash_unlock();
+
     // Wait if flash is busy
     while (FLASH->SR & (1<<16))
         ;
+    flash_unlock();
+
     FLASH->SR = FLASH->SR;
 
     // enable flash erase and select page
@@ -72,6 +117,8 @@ void flash_write(uint32_t addr, uint8_t * data, size_t sz)
 {
     int i;
     uint8_t buf[8];
+    while (FLASH->SR & (1<<16))
+        ;
     flash_unlock();
 
     // dword align
diff --git a/targets/stm32l442/src/flash.h b/targets/stm32l442/src/flash.h
index e4841df..f099700 100644
--- a/targets/stm32l442/src/flash.h
+++ b/targets/stm32l442/src/flash.h
@@ -4,6 +4,7 @@
 void flash_erase_page(uint8_t page);
 void flash_write_dword(uint32_t addr, uint64_t data);
 void flash_write(uint32_t addr, uint8_t * data, size_t sz);
+void flash_option_bytes_init(int boot_from_dfu);
 
 #define FLASH_PAGE_SIZE     2048
 
diff --git a/targets/stm32l442/src/led.c b/targets/stm32l442/src/led.c
index f8373aa..2393d7b 100644
--- a/targets/stm32l442/src/led.c
+++ b/targets/stm32l442/src/led.c
@@ -6,6 +6,7 @@
 
 #include "led.h"
 #include "device.h"
+#include "log.h"
 
 void led_rgb(uint32_t hex)
 {
@@ -46,9 +47,9 @@ void led_test_colors()
     while(1)
     {
 
-        printf("%d: %lu\r\n", j++, millis());
+        printf1(TAG_GREEN, "%d: %lu\r\n", j++, millis());
 
-        printf("white pulse\r\n");
+        printf1(TAG_GREEN,"white pulse\r\n");
         time = millis();
         while((millis() - time) < 5000)
         {
@@ -56,7 +57,7 @@ void led_test_colors()
             led_rgb(i | (i << 8) | (i << 16));
         }
 
-        printf("blue pulse\r\n");
+        printf1(TAG_GREEN,"blue pulse\r\n");
         time = millis();
         while((millis() - time) < 5000)
         {
@@ -64,7 +65,7 @@ void led_test_colors()
             led_rgb(i);
         }
 
-        printf("green pulse\r\n");
+        printf1(TAG_GREEN,"green pulse\r\n");
         time = millis();
         while((millis() - time) < 5000)
         {
@@ -72,7 +73,7 @@ void led_test_colors()
             led_rgb(i<<8);
         }
 
-        printf("red pulse\r\n");
+        printf1(TAG_GREEN,"red pulse\r\n");
         time = millis();
         while((millis() - time) < 5000)
         {
@@ -80,7 +81,7 @@ void led_test_colors()
             led_rgb(i<<16);
         }
 
-        printf("purple pulse\r\n");
+        printf1(TAG_GREEN,"purple pulse\r\n");
         time = millis();
         while((millis() - time) < 5000)
         {
@@ -88,7 +89,7 @@ void led_test_colors()
             led_rgb((i<<16) | i);
         }
 
-        printf("orange pulse\r\n");
+        printf1(TAG_GREEN,"orange pulse\r\n");
         time = millis();
         while((millis() - time) < 5000)
         {
@@ -96,7 +97,7 @@ void led_test_colors()
             led_rgb((i<<16) | (i<<8));
         }
 
-        printf("yellow pulse\r\n");
+        printf1(TAG_GREEN,"yellow pulse\r\n");
         time = millis();
         while((millis() - time) < 5000)
         {
@@ -105,5 +106,3 @@ void led_test_colors()
         }
     }
 }
-
-
diff --git a/targets/stm32l442/src/redirect.c b/targets/stm32l442/src/redirect.c
index 0f997d6..5c8dbf4 100644
--- a/targets/stm32l442/src/redirect.c
+++ b/targets/stm32l442/src/redirect.c
@@ -3,7 +3,7 @@
 #include "app.h"
 #include "fifo.h"
 
-
+#if DEBUG_LEVEL>0
 
 void _putchar(char c)
 {
@@ -16,6 +16,8 @@ void _putchar(char c)
 #endif
 }
 
+
+
 int _write (int fd, const void *buf, long int len)
 {
     uint8_t * data = (uint8_t *) buf;
@@ -26,3 +28,4 @@ int _write (int fd, const void *buf, long int len)
     return 0;
 
 }
+#endif