diff --git a/fido2/ctaphid.c b/fido2/ctaphid.c
index 33fdddc..f1e808c 100644
--- a/fido2/ctaphid.c
+++ b/fido2/ctaphid.c
@@ -710,6 +710,7 @@ uint8_t ctaphid_custom_command(int len, CTAP_RESPONSE * ctap_resp, CTAPHID_WRITE
             printf1(TAG_HID,"CTAPHID_BOOT\n");
             u2f_set_writeback_buffer(ctap_resp);
             is_busy = bootloader_bridge(len, ctap_buffer);
+            wb->bcnt = 1 + ctap_resp->length;
 
             ctaphid_write(wb, &is_busy, 1);
             ctaphid_write(wb, ctap_resp->data, ctap_resp->length);
diff --git a/targets/stm32l432/bootloader/bootloader.h b/targets/stm32l432/bootloader/bootloader.h
index 4c0b5a6..cb3b200 100644
--- a/targets/stm32l432/bootloader/bootloader.h
+++ b/targets/stm32l432/bootloader/bootloader.h
@@ -9,7 +9,6 @@
 #define _APP_H_
 #include <stdint.h>
 #include "version.h"
-
 #define DEBUG_UART      USART1
 
 #ifndef DEBUG_LEVEL
@@ -21,6 +20,7 @@
 #define BOOT_TO_DFU         0
 
 
+#define SOLO                1
 #define IS_BOOTLOADER       1
 
 #define ENABLE_U2F_EXTENSIONS