fix bug loader fw SSH, update doc, update scan ip ( scan nhanh hơn )

main.py

@@ -55,7 +55,7 @@ class App(QWidget):
         self.firmware = None
         self.all_devices = []  # raw list from scanner
         self.devices = []      # filtered list for table
-        self.flashed_macs = set()  # MAC addresses flashed successfully in session
+        self.flashed_macs = {}  # MAC addresses flashed successfully in session (MAC -> timestamp)
         self.scan_thread = None
 
         info = get_machine_info()
@@ -300,19 +300,6 @@ class App(QWidget):
         ssh_row1.addStretch()
         ssh_creds_layout.addLayout(ssh_row1)
 
-        ssh_row2 = QHBoxLayout()
-        ssh_lbl3 = QLabel("Backup Pass:")
-        ssh_lbl3.setStyleSheet("font-size: 12px; font-weight: bold;")
-        ssh_row2.addWidget(ssh_lbl3)
-        self.ssh_backup_pass_input = QLineEdit("admin")
-        self.ssh_backup_pass_input.setEchoMode(QLineEdit.EchoMode.Password)
-        self.ssh_backup_pass_input.setFixedWidth(130)
-        self.ssh_backup_pass_input.setStyleSheet(str_qlineedit)
-        self.ssh_backup_pass_input.setToolTip("Password to try if device already has a password (fallback)")
-        ssh_row2.addWidget(self.ssh_backup_pass_input)
-        ssh_row2.addStretch()
-        ssh_creds_layout.addLayout(ssh_row2)
-
         self.set_passwd_cb = QCheckBox("Set password before flash (passwd → admin123a)")
         self.set_passwd_cb.setChecked(True)
         self.set_passwd_cb.setStyleSheet("color: #94a3b8; font-size: 12px; font-weight: bold;")
@@ -461,8 +448,14 @@ class App(QWidget):
         if not self.flashed_macs:
             QMessageBox.information(self, "Flash History", "No successful flashes during this session.")
         else:
-            macs = "\n".join(sorted(list(self.flashed_macs)))
-            msg = f"Successfully flashed devices in this session ({len(self.flashed_macs)}):\n\n{macs}"
+            # Sort by MAC and format with timestamp
+            history_lines = []
+            for mac in sorted(self.flashed_macs.keys()):
+                time_str = self.flashed_macs[mac]
+                history_lines.append(f"[{time_str}] {mac}")
+            
+            macs_str = "\n".join(history_lines)
+            msg = f"Successfully flashed devices in this session ({len(self.flashed_macs)}):\n\n{macs_str}"
             QMessageBox.information(self, "Flash History", msg)
 
     # ── Actions ──
@@ -648,7 +641,7 @@ class App(QWidget):
             method = self.method_combo.currentData()
             ssh_user = self.ssh_user_input.text().strip() or "root"
             ssh_password = self.ssh_pass_input.text() or "admin123a"
-            ssh_backup_password = self.ssh_backup_pass_input.text()
+            ssh_backup_password = "admin123a"
             set_passwd = self.set_passwd_cb.isChecked() if method == "ssh" else False
 
         # Run flashing in background thread so UI doesn't freeze
@@ -678,10 +671,12 @@ class App(QWidget):
             item = QTableWidgetItem(f"✅ {result}")
             item.setForeground(QColor("#a6e3a1"))
             
-            # Save MAC to history
+            # Save MAC to history with current timestamp
             mac_item = self.table.item(row, 2)
             if mac_item:
-                self.flashed_macs.add(mac_item.text().strip())
+                import datetime
+                now_str = datetime.datetime.now().strftime("%H:%M:%S")
+                self.flashed_macs[mac_item.text().strip()] = now_str
 
             # Auto-uncheck so it won't be flashed again
             cb = self.table.item(row, 0)