diff --git a/BACKEND/app/services/line_connection.ts b/BACKEND/app/services/line_connection.ts
index 8c7e4e9..fcf202f 100644
--- a/BACKEND/app/services/line_connection.ts
+++ b/BACKEND/app/services/line_connection.ts
@@ -157,7 +157,9 @@ export default class LineConnection {
     this.outputPhysicalTest = ''
     this.listDeviceIos = []
   }
-
+  /**
+   * Connect to line with socket
+   */
   connect(timeoutMs = 5000) {
     return new Promise<void>((resolve, reject) => {
       const { ip, port, lineNumber, id, stationId } = this.config
@@ -304,10 +306,16 @@ export default class LineConnection {
     })
   }
 
+  /**
+   * Waiting with millisecond
+   */
   private sleep(ms: number) {
     return new Promise((resolve) => setTimeout(resolve, ms))
   }
 
+  /**
+   * Write a command with socket.write
+   */
   async writeCommand(cmd: string | Buffer<ArrayBuffer>, userName = '') {
     if (this.client.destroyed) {
       console.log(`⚠️ Cannot send, line ${this.config.lineNumber} is closed`)
@@ -326,6 +334,9 @@ export default class LineConnection {
     this.client.write(cmd)
   }
 
+  /**
+   * Disconnect socket with line
+   */
   async disconnect() {
     try {
       console.log('[DISCONNECT] Line', this.config.lineNumber)
@@ -342,6 +353,9 @@ export default class LineConnection {
     }
   }
 
+  /**
+   * Run a scenario as DPELP, Breaking password, load ios,...
+   */
   async runScript(script: Scenario, userName: string) {
     if (!this.client || this.client.destroyed) {
       console.log('Not connected')
@@ -575,7 +589,7 @@ export default class LineConnection {
           // }
 
           if (typeof step.send !== 'undefined') {
-            // console.log(Date.now() - now, (step?.send ?? '[ENTER]').toString())
+            console.log(Date.now() - now, (step?.send ?? '[ENTER]').toString())
             this.outputScenario += `\n---send-command---"${(step?.send ?? '[ENTER]').toString().replace(/\r/g, '\\r').replace(/\n/g, '\\n')}"---${now}---\n`
             appendLog(
               `\n---send-command---"${(step?.send ?? '[ENTER]').toString().replace(/\r/g, '\\r').replace(/\n/g, '\\n')}"---${now}---\n`,
@@ -620,6 +634,9 @@ export default class LineConnection {
     })
   }
 
+  /**
+   * Reconnect socket with line
+   */
   public async reconnect(): Promise<boolean> {
     try {
       this.disconnect()
@@ -632,6 +649,9 @@ export default class LineConnection {
     }
   }
 
+  /**
+   * User open CLI from front-end
+   */
   userOpenCLI(user: User) {
     this.config.openCLI = true
     this.config.userEmailOpenCLI = user.userEmail
@@ -651,6 +671,9 @@ export default class LineConnection {
     )
   }
 
+  /**
+   * User close CLI from front-end
+   */
   userCloseCLI() {
     this.config.openCLI = false
     this.config.userEmailOpenCLI = ''
@@ -662,6 +685,9 @@ export default class LineConnection {
     })
   }
 
+  /**
+   * Clear output buffer
+   */
   clearCLI() {
     this.config.output = ''
     this.socketIO.emit('user_clear_terminal', {
@@ -671,6 +697,9 @@ export default class LineConnection {
     setTimeout(() => this.writeCommand('\r\n'), 100)
   }
 
+  /**
+   * Waiting for a expect with until catch it from output
+   */
   waitForExpect = async (expect: string, timeout = 60000) => {
     const start = Date.now()
     // console.log('[EXPECT]', expect, timeout)
@@ -684,6 +713,9 @@ export default class LineConnection {
     return false
   }
 
+  /**
+   * Detect inventory data from output
+   */
   getInventory = () => {
     const data = textfsmResults(this.outputInventory, 'show inventory')
     try {
@@ -714,7 +746,9 @@ export default class LineConnection {
     }
   }
 
-  // Gửi nhiều ký tự ESC để vào ROMMON
+  /**
+   * Gửi nhiều ký tự ESC để vào ROMMON
+   */
   breakSpam() {
     console.log('SPAM Break to line:', this.config.lineNumber)
     let count = 0
@@ -728,6 +762,9 @@ export default class LineConnection {
     }, 1)
   }
 
+  /**
+   * Set Baud of line
+   */
   async setBaud(baud: number) {
     this.writeCommand('enable\r\n')
     await sleep(500)
@@ -743,6 +780,9 @@ export default class LineConnection {
     this.writeCommand('\r\n')
   }
 
+  /**
+   * Get content's log of line with date
+   */
   async getLog(date: string) {
     const logDir = path.join('storage', 'system_logs')
     const logFile = path
@@ -759,6 +799,9 @@ export default class LineConnection {
     return await fs.promises.readFile(logFile, 'utf8')
   }
 
+  /**
+   * Detect log by call api gpt, return summary and issues
+   */
   async detectLogWithAI(log: string) {
     try {
       const payload = {
@@ -812,6 +855,9 @@ export default class LineConnection {
     return ''
   }
 
+  /**
+   * Add cache to list history devices on this line
+   */
   async addHistory(stationId: number, lineId: number, item: HistoryItem) {
     if (!item.pid || !item.sn) return
     const key = `station:${stationId}:line:${lineId}:history`
@@ -850,12 +896,18 @@ export default class LineConnection {
     return true
   }
 
+  /**
+   * Get list history devices
+   */
   async getHistory(stationId: number, lineId: number) {
     const key = `station:${stationId}:line:${lineId}:history`
     const items = await redis.zrange(key, 0, -1)
     return items.map((i) => JSON.parse(i))
   }
 
+  /**
+   * Handle raw log to regex error
+   */
   handleLogLine = (line: string) => {
     try {
       const parsed = classifyLog(line)
@@ -865,6 +917,9 @@ export default class LineConnection {
     }
   }
 
+  /**
+   * Check raw log was regex each 5 minutes, if has error will send email report
+   */
   checkLog() {
     const interval = setInterval(async () => {
       try {
@@ -902,6 +957,9 @@ export default class LineConnection {
     }, 300000)
   }
 
+  /**
+   * Render table to view error
+   */
   renderErrorTable(rows: ErrorRow[]): string {
     if (!rows.length) {
       return `<p style="color: green;">No errors detected</p>`
@@ -942,6 +1000,9 @@ export default class LineConnection {
   `
   }
 
+  /**
+   * Return a body email
+   */
   buildEmailContent(result: TestResult): string {
     const rows = mapErrorsToRows(result.errors)
     const table = this.renderErrorTable(rows)
@@ -956,6 +1017,9 @@ export default class LineConnection {
   `
   }
 
+  /**
+   * Update note of SN to ERP after run DPELP
+   */
   async updateNote(sn: string, data: DataDPELP) {
     const licenses = Array.isArray(data.license)
       ? [...new Set(data.license)]
@@ -968,6 +1032,9 @@ export default class LineConnection {
     await updateNoteToERP(sn, note)
   }
 
+  /**
+   * Starting physical test (PoE ports testing)
+   */
   async runPhysicalTest() {
     if (this.config.runningPhysical) {
       console.log('Running physical test')
@@ -1002,6 +1069,9 @@ export default class LineConnection {
     // }, 10000)
   }
 
+  /**
+   * End all testing
+   */
   endTesting() {
     this.physicalTest.done = true
     this.physicalTest.resetTestedPorts()
@@ -1018,6 +1088,9 @@ export default class LineConnection {
     })
   }
 
+  /**
+   * Get list PoE ports
+   */
   async getPorts(): Promise<string[]> {
     this.writeCommand('    show power inline\r\n')
     this.writeCommand('    \r\n')
@@ -1040,6 +1113,9 @@ export default class LineConnection {
     return [...new Set(ports)]
   }
 
+  /**
+   * Send report after done physical test
+   */
   async sendReportPhysicalTest() {
     const formReport = this.physicalTest.getFormReport()
     await sendMessageToMail(
@@ -1048,6 +1124,9 @@ export default class LineConnection {
     )
   }
 
+  /**
+   * Handle load ios for router
+   */
   async loadIosRouter(nameIos: string, userName: string) {
     const station = await Station.find(this.config.stationId)
     if (!station) return
@@ -1193,6 +1272,9 @@ export default class LineConnection {
     await this.sendEmailLoadIos(nameIos, startTime)
   }
 
+  /**
+   * Handle load ios for switch
+   */
   async loadIosSwitch(nameIos: string, userName: string) {
     const station = await Station.find(this.config.stationId)
     if (!station) return
@@ -1402,6 +1484,9 @@ export default class LineConnection {
     await this.sendEmailLoadIos(nameIos, startTime)
   }
 
+  /**
+   * Send mail report after load ios
+   */
   async sendEmailLoadIos(nameIos: string, startTime: string) {
     const timeZone = process.env.TIME_ZONE || 'Australia/Sydney'
     const dataFormat = momentTZ().tz(timeZone).format('YYYY/MM/DD, HH:mm:ss')
@@ -1422,20 +1507,38 @@ export default class LineConnection {
     )
   }
 
+  /**
+   * Check list ios exist on flash
+   */
   async checkDeviceFlash() {
     this.writeCommand('    enable\r\n')
     this.writeCommand('show flash:\r\n')
     await sleep(2000)
-    const ios = []
-    const binRegex = /^\s*\d+\s+-rwx\s+\d+\s+.*?\s+([^\s]+\.bin)\s*$/gim
 
+    const output = this.outputBuffer
+    const ios: string[] = []
     let match
-    while ((match = binRegex.exec(this.outputBuffer)) !== null) {
-      ios.push(match[1])
+
+    const SWITCH_BIN_REGEX = /^\s*\d+\s+-rwx\s+\d+\s+.*?\s+([^\s]+\.bin)\s*$/gim
+    const ROUTER_BIN_REGEX = /^\s*\d+\s+(\d+)\s+.*?\s+([^\s]+\.bin)\s*$/gim
+
+    // 🔍 Detect device type
+    const isSwitch = output.includes('-rwx')
+    const regex = isSwitch ? SWITCH_BIN_REGEX : ROUTER_BIN_REGEX
+
+    // reset regex state
+    regex.lastIndex = 0
+
+    while ((match = regex.exec(output)) !== null) {
+      ios.push(isSwitch ? match[1] : match[2])
     }
+
     return ios
   }
 
+  /**
+   * Delete File on Flash
+   */
   async deleteFileOnFlash(fileName: string) {
     await this.writeCommand(`delete flash:${fileName}\r\n`)
     await this.writeCommand(`\r\n`)
@@ -1443,6 +1546,9 @@ export default class LineConnection {
     await sleep(3000)
   }
 
+  /**
+   * Upload file from flash to TFTP server
+   */
   async uploadFileToServerTFTP(fileName: string, server: string) {
     this.config.runningScenario = 'Upload file'
     await this.writeCommand(`copy flash: tftp:\r\n`)
@@ -1460,7 +1566,9 @@ export default class LineConnection {
     }
   }
 
-  // function get list ios
+  /**
+   * Get list ios from TFTP server
+   */
   async getListIos() {
     try {
       const controller = new IosLicenseController()
@@ -1472,6 +1580,9 @@ export default class LineConnection {
     }
   }
 
+  /**
+   * Get current boot ios of device
+   */
   async getCurrentBootIos() {
     this.writeCommand('show version | include System image\r\n')
     await sleep(2000)
@@ -1482,6 +1593,9 @@ export default class LineConnection {
     return match ? match[1] : null
   }
 
+  /**
+   * Backup ios to TFTP, after that delete it on flash for free space
+   */
   async backupIos(nameIos: string) {
     const station = await Station.find(this.config.stationId)
     if (!station) return