diff --git a/core/embed/bootloader/protob/messages.pb.c b/core/embed/bootloader/protob/messages.pb.c
index 76f60b935c..e39946e5e1 100644
--- a/core/embed/bootloader/protob/messages.pb.c
+++ b/core/embed/bootloader/protob/messages.pb.c
@@ -1,5 +1,5 @@
 /* Automatically generated nanopb constant definitions */
-/* Generated by nanopb-0.4.1 */
+/* Generated by nanopb-0.4.3 */
 
 #include "messages.pb.h"
 #if PB_PROTO_HEADER_VERSION != 40
diff --git a/core/embed/bootloader/protob/messages.pb.h b/core/embed/bootloader/protob/messages.pb.h
index e3d94d004d..6591fec043 100644
--- a/core/embed/bootloader/protob/messages.pb.h
+++ b/core/embed/bootloader/protob/messages.pb.h
@@ -1,5 +1,5 @@
 /* Automatically generated nanopb header */
-/* Generated by nanopb-0.4.1 */
+/* Generated by nanopb-0.4.3 */
 
 #ifndef PB_MESSAGES_PB_H_INCLUDED
 #define PB_MESSAGES_PB_H_INCLUDED
@@ -9,10 +9,6 @@
 #error Regenerate this file with the current version of nanopb generator.
 #endif
 
-#ifdef __cplusplus
-extern "C" {
-#endif
-
 /* Enum definitions */
 typedef enum _MessageType {
     MessageType_MessageType_Initialize = 0,
@@ -147,6 +143,10 @@ typedef struct _Success {
 #define _ButtonRequestType_ARRAYSIZE ((ButtonRequestType)(ButtonRequestType_ButtonRequest_Other+1))
 
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /* Initializer values for message structs */
 #define Initialize_init_default                  {0}
 #define GetFeatures_init_default                 {0}
@@ -246,12 +246,12 @@ X(a, STATIC,   OPTIONAL, STRING,   message,           1)
 X(a, STATIC,   OPTIONAL, UENUM,    code,              1) \
 X(a, STATIC,   OPTIONAL, STRING,   message,           2)
 #define Failure_CALLBACK NULL
-#define Failure_DEFAULT NULL
+#define Failure_DEFAULT (const pb_byte_t*)"\x08\x01\x00"
 
 #define ButtonRequest_FIELDLIST(X, a) \
 X(a, STATIC,   OPTIONAL, UENUM,    code,              1)
 #define ButtonRequest_CALLBACK NULL
-#define ButtonRequest_DEFAULT NULL
+#define ButtonRequest_DEFAULT (const pb_byte_t*)"\x08\x01\x00"
 
 #define ButtonAck_FIELDLIST(X, a) \