diff --git a/protocol/protocol.go b/protocol/protocol.go
index f581657..011c117 100644
--- a/protocol/protocol.go
+++ b/protocol/protocol.go
@@ -332,6 +332,26 @@ func (p *Protocol) processRequest(conn net.Conn, message string) {
 		}
 
 		log.Info(fmt.Sprintf("%sConnected client version: '%s' [set KeepDaemonAlone = %t]", p.connLogID(conn), req.Version, req.KeepDaemonAlone))
+
+		// When upgrading from old client version, it is necessary to copy current credentials from UI client
+		if len(req.SetRawCredentials.AccountID) > 0 && len(req.SetRawCredentials.Session) > 0 {
+			r := req.SetRawCredentials
+			if err := p._service.SetRawCredentials(r.AccountID,
+				r.Session,
+				r.OvpnUser,
+				r.OvpnPass,
+				r.WgPublicKey,
+				r.WgPrivateKey,
+				r.WgLocalIP,
+				r.WgKeyGenerated); err != nil {
+				// failed to save RAW credentials
+				err := fmt.Errorf("failed to register RAW credentials: %w", err)
+				log.Error(err)
+				p.sendErrorResponse(conn, reqCmd, err)
+				return
+			}
+		}
+
 		// send back Hello message with account session info
 		p.sendResponse(conn, p.createHelloResponse(), req.Idx)
 
@@ -560,28 +580,6 @@ func (p *Protocol) processRequest(conn net.Conn, message string) {
 		p.sendResponse(conn, &types.EmptyResp{}, reqCmd.Idx)
 		break
 
-	case "SetCredentials":
-		var r types.SetCredentials
-		if err := json.Unmarshal(messageData, &r); err != nil {
-			p.sendErrorResponse(conn, reqCmd, err)
-			break
-		}
-
-		if err := p._service.SetRawCredentials(r.AccountID,
-			r.Session,
-			r.OvpnUser,
-			r.OvpnPass,
-			r.WgPublicKey,
-			r.WgPrivateKey,
-			r.WgLocalIP,
-			r.WgKeyGenerated); err != nil {
-			p.sendErrorResponse(conn, reqCmd, err)
-		} else {
-			p.sendResponse(conn, &types.EmptyResp{}, reqCmd.Idx)
-		}
-
-		break
-
 	case "SessionNew":
 		var req types.SessionNew
 		if err := json.Unmarshal(messageData, &req); err != nil {
diff --git a/protocol/types/requests.go b/protocol/types/requests.go
index a6e1039..c829e01 100644
--- a/protocol/types/requests.go
+++ b/protocol/types/requests.go
@@ -18,6 +18,22 @@ type Hello struct {
 	//	KeepDaemonAlone == false (default) - VPN disconnects when client disconnects from a daemon
 	//	KeepDaemonAlone == true - do nothing when client disconnects from a daemon (if VPN is connected - do not disconnect)
 	KeepDaemonAlone bool
+
+	// Register credentials (if not logged in)
+	// Used when updating from an old client version
+	SetRawCredentials RawCredentials
+}
+
+// RawCredentials - RAW credentials
+type RawCredentials struct {
+	AccountID      string
+	Session        string
+	OvpnUser       string
+	OvpnPass       string
+	WgPublicKey    string
+	WgPrivateKey   string
+	WgLocalIP      string
+	WgKeyGenerated int64 // Unix time
 }
 
 // GetServers request servers list
@@ -167,16 +183,3 @@ type WireGuardSetKeysRotationInterval struct {
 	CommandBase
 	Interval int64
 }
-
-// SetCredentials - manually set RAW credentials
-type SetCredentials struct {
-	CommandBase
-	AccountID      string
-	Session        string
-	OvpnUser       string
-	OvpnPass       string
-	WgPublicKey    string
-	WgPrivateKey   string
-	WgLocalIP      string
-	WgKeyGenerated int64 // Unix time
-}