diff --git a/common/protob/messages-common.proto b/common/protob/messages-common.proto
index be38977cf..7f1fdc43a 100644
--- a/common/protob/messages-common.proto
+++ b/common/protob/messages-common.proto
@@ -156,5 +156,5 @@ message HDNodeType {
     required uint32 child_num = 3;
     required bytes chain_code = 4;
     optional bytes private_key = 5;
-    optional bytes public_key = 6;
+    required bytes public_key = 6;
 }
diff --git a/common/protob/messages-management.proto b/common/protob/messages-management.proto
index 3b9a420e9..3799fb964 100644
--- a/common/protob/messages-management.proto
+++ b/common/protob/messages-management.proto
@@ -301,7 +301,7 @@ message RecoveryDevice {
     optional uint32 word_count = 1;                     // number of words in BIP-39 mnemonic
     optional bool passphrase_protection = 2;            // enable master node encryption using passphrase
     optional bool pin_protection = 3;                   // enable PIN protection
-    optional string language = 4 [default='en-US'];     // device language (IETF BCP 47 language tag)
+    optional string language = 4;                       // device language (IETF BCP 47 language tag)
     optional string label = 5;                          // device label
     optional bool enforce_wordlist = 6;                 // enforce BIP-39 wordlist during the process
     // 7 reserved for unused recovery method