diff --git a/sources/Android/android-communications/library/src/sdk/java/com/polar/sdk/impl/BDBleApiImpl.kt b/sources/Android/android-communications/library/src/sdk/java/com/polar/sdk/impl/BDBleApiImpl.kt
index 579b63b2..9c123cb9 100644
--- a/sources/Android/android-communications/library/src/sdk/java/com/polar/sdk/impl/BDBleApiImpl.kt
+++ b/sources/Android/android-communications/library/src/sdk/java/com/polar/sdk/impl/BDBleApiImpl.kt
@@ -1991,7 +1991,7 @@ class BDBleApiImpl private constructor(context: Context, features: Set<PolarBleS
 
                                                                 doFactoryReset(identifier, true)
                                                                         .andThen(Completable.timer(30, TimeUnit.SECONDS))
-                                                                        .andThen(waitDeviceSessionToOpen(identifier, factoryResetMaxWaitTimeSeconds, waitForDeviceDownSeconds = 10L))
+                                                                        .andThen(waitDeviceSessionWithPftpToOpen(identifier, factoryResetMaxWaitTimeSeconds, waitForDeviceDownSeconds = 10L))
                                                                         .andThen(Completable.timer(5, TimeUnit.SECONDS))
                                                                         .andThen(
                                                                                 Flowable.fromIterable(firmwareFiles)
@@ -2015,7 +2015,7 @@ class BDBleApiImpl private constructor(context: Context, features: Set<PolarBleS
                                                                     BleLogger.d(TAG, "Starting finalization of firmware update")
                                                                     Completable.timer(rebootTriggeredWaitTimeSeconds, TimeUnit.SECONDS)
                                                                             .andThen(
-                                                                                    waitDeviceSessionToOpen(identifier, factoryResetMaxWaitTimeSeconds, if (isDeviceSensor) 0L else 120L)
+                                                                                    waitDeviceSessionWithPftpToOpen(identifier, factoryResetMaxWaitTimeSeconds, if (isDeviceSensor) 0L else 120L)
                                                                                             .andThen(
                                                                                                     Completable.fromCallable {
                                                                                                         BleLogger.d(TAG, "Restoring backup to device after version ${firmwareUpdateResponse.version}")
@@ -2031,7 +2031,7 @@ class BDBleApiImpl private constructor(context: Context, features: Set<PolarBleS
                                                             }
                                                             .concatMap { status ->
                                                                 if (status is FirmwareUpdateStatus.FinalizingFwUpdate) {
-                                                                    waitDeviceSessionToOpen(identifier, factoryResetMaxWaitTimeSeconds, if (isDeviceSensor) 0L else 60L)
+                                                                    waitDeviceSessionWithPftpToOpen(identifier, factoryResetMaxWaitTimeSeconds, if (isDeviceSensor) 0L else 60L)
                                                                             .andThen(Flowable.just(FirmwareUpdateStatus.FwUpdateCompletedSuccessfully(firmwareUpdateResponse.version)))
                                                                 } else {
                                                                     Flowable.just(status)
@@ -2403,12 +2403,12 @@ class BDBleApiImpl private constructor(context: Context, features: Set<PolarBleS
         }, BackpressureStrategy.BUFFER)
     }
 
-    private fun waitDeviceSessionToOpen(
+    private fun waitDeviceSessionWithPftpToOpen(
             deviceId: String,
             timeoutSeconds: Long,
             waitForDeviceDownSeconds: Long = 0L
     ): Completable {
-        BleLogger.d(TAG, "waitDeviceSessionToOpen(), seconds: $timeoutSeconds, waitForDeviceDownSeconds: $waitForDeviceDownSeconds")
+        BleLogger.d(TAG, "waitDeviceSessionWithPftpToOpen(): seconds $timeoutSeconds, waitForDeviceDownSeconds $waitForDeviceDownSeconds")
         val pollIntervalSeconds = 5L
 
         return Observable.timer(waitForDeviceDownSeconds, TimeUnit.SECONDS)
@@ -2419,15 +2419,20 @@ class BDBleApiImpl private constructor(context: Context, features: Set<PolarBleS
                             .takeUntil(Observable.timer(timeoutSeconds, TimeUnit.SECONDS))
                             .timeout(timeoutSeconds, TimeUnit.SECONDS)
                             .subscribe({
-                                if (deviceSessionState == DeviceSessionState.SESSION_OPEN) {
-                                    BleLogger.d(TAG, "Session opened, deviceId: $deviceId")
+                                val isSessionOpen = deviceSessionState == DeviceSessionState.SESSION_OPEN
+                                val isPftpClientReady = isPftpClientReady(deviceId)
+
+                                BleLogger.d(TAG, "waitDeviceSessionWithPftpToOpen(): isSessionOpen $isSessionOpen, isPftpClientReady $isPftpClientReady")
+
+                                if (isSessionOpen && isPftpClientReady) {
+                                    BleLogger.d(TAG, "waitDeviceSessionWithPftpToOpen(): completed")
                                     disposable?.dispose()
                                     emitter.onComplete()
                                 } else {
-                                    BleLogger.d(TAG, "Waiting for device session to open, deviceId: $deviceId, current state: $deviceSessionState")
+                                    BleLogger.d(TAG, "waitDeviceSessionWithPftpToOpen(): current state $deviceSessionState")
                                 }
                             }, { error ->
-                                BleLogger.e(TAG, "Timeout reached while waiting for device session to open, deviceId: $deviceId")
+                                BleLogger.e(TAG, "waitDeviceSessionWithPftpToOpen(): error $error")
                                 emitter.onError(error)
                             })
                     emitter.setCancellable {
@@ -2436,6 +2441,22 @@ class BDBleApiImpl private constructor(context: Context, features: Set<PolarBleS
                 })
     }
 
+    private fun isPftpClientReady(identifier: String): Boolean {
+        try {
+            val session = sessionPsFtpClientReady(identifier)
+
+            val client = session.fetchClient(BlePsFtpUtils.RFC77_PFTP_SERVICE) as BlePsFtpClient?
+            if (client != null) {
+                return true
+            }
+
+            return false
+        }
+        catch (error: Throwable) {
+            return false
+        }
+    }
+
     override fun deleteStoredDeviceData(identifier: String, dataType: PolarStoredDataType, until: LocalDate?): Completable {
 
         fileDeletionMap.clear()
diff --git a/sources/iOS/ios-communications/Sources/PolarBleSdk/sdk/impl/PolarBleApiImpl.swift b/sources/iOS/ios-communications/Sources/PolarBleSdk/sdk/impl/PolarBleApiImpl.swift
index dd7fbd0b..c7affc21 100644
--- a/sources/iOS/ios-communications/Sources/PolarBleSdk/sdk/impl/PolarBleApiImpl.swift
+++ b/sources/iOS/ios-communications/Sources/PolarBleSdk/sdk/impl/PolarBleApiImpl.swift
@@ -2335,7 +2335,7 @@ extension PolarBleApiImpl: PolarBleApi  {
                                         BleLogger.trace("Firmware update is in finalizing stage")
 
                                         BleLogger.trace("Device rebooting")
-                                        self.waitDeviceSessionToOpen(deviceId: identifier, timeoutSeconds: Int(factoryResetMaxWaitTimeSeconds), waitForDeviceDownSeconds: 10)
+                                        self.waitDeviceSessionWithPftpToOpen(deviceId: identifier, timeoutSeconds: Int(factoryResetMaxWaitTimeSeconds), waitForDeviceDownSeconds: 10)
                                             .do(onSubscribe: {
                                                 BleLogger.trace("Waiting for device session to open after reboot with timeout: \(rebootMaxWaitTimeSeconds) seconds")
                                             })
@@ -2350,7 +2350,7 @@ extension PolarBleApiImpl: PolarBleApi  {
                                             }
                                             .flatMap { _ in
                                                 BleLogger.trace("Waiting for device session to open after factory reset with timeout: \(factoryResetMaxWaitTimeSeconds) seconds")
-                                                return self.waitDeviceSessionToOpen(deviceId: identifier, timeoutSeconds: Int(factoryResetMaxWaitTimeSeconds), waitForDeviceDownSeconds: 10)
+                                                return self.waitDeviceSessionWithPftpToOpen(deviceId: identifier, timeoutSeconds: Int(factoryResetMaxWaitTimeSeconds), waitForDeviceDownSeconds: 10)
                                                     .do(onSubscribe: {
                                                         BleLogger.trace("Waiting for device session to open post factory reset")
                                                     })
@@ -3060,7 +3060,7 @@ extension PolarBleApiImpl: PolarBleApi  {
         let factoryResetMaxWaitTimeSeconds: TimeInterval = 6 * 60
         BleLogger.trace("Write FW to device")
         return doFactoryReset(deviceId, preservePairingInformation: true)
-                .andThen(waitDeviceSessionToOpen(deviceId: deviceId, timeoutSeconds: Int(factoryResetMaxWaitTimeSeconds), waitForDeviceDownSeconds: 10))
+                .andThen(waitDeviceSessionWithPftpToOpen(deviceId: deviceId, timeoutSeconds: Int(factoryResetMaxWaitTimeSeconds), waitForDeviceDownSeconds: 10))
                 .andThen(Observable.create { observer in
                     do {
                         let session = try self.sessionFtpClientReady(deviceId)
@@ -3109,9 +3109,8 @@ extension PolarBleApiImpl: PolarBleApi  {
                 })
     }
 
-
-    private func waitDeviceSessionToOpen(deviceId: String, timeoutSeconds: Int, waitForDeviceDownSeconds: Int = 0) -> Completable {
-        BleLogger.trace("Wait for device session to open, timeoutSeconds: \(timeoutSeconds), waitForDeviceDownSeconds: \(waitForDeviceDownSeconds)")
+    private func waitDeviceSessionWithPftpToOpen(deviceId: String, timeoutSeconds: Int, waitForDeviceDownSeconds: Int = 0) -> Completable {
+        BleLogger.trace("waitDeviceSessionWithPftpToOpen(): timeoutSeconds \(timeoutSeconds), waitForDeviceDownSeconds \(waitForDeviceDownSeconds)")
         let pollIntervalSeconds = 5
 
         return Completable.create { emitter in
@@ -3123,15 +3122,20 @@ extension PolarBleApiImpl: PolarBleApi  {
                 }
                 .timeout(RxTimeInterval.seconds(timeoutSeconds), scheduler: MainScheduler.instance)
                 .subscribe(onNext: { _ in
-                    if self.deviceSessionState == BleDeviceSession.DeviceSessionState.sessionOpen {
-                        BleLogger.trace("Session opened, deviceId: \(deviceId)")
+                    let isSessionOpen = self.deviceSessionState == BleDeviceSession.DeviceSessionState.sessionOpen
+                    let isPftpClientReady = self.isPftpClientReady(deviceId)
+                    
+                    BleLogger.trace("waitDeviceSessionWithPftpToOpen(): isSessionOpen \(isSessionOpen), isFTPReady \(isPftpClientReady)")
+                    
+                    if isSessionOpen && isPftpClientReady {
+                        BleLogger.trace("waitDeviceSessionWithPftpToOpen(): completed")
                         disposable?.dispose()
                         emitter(.completed)
                     } else {
-                        BleLogger.trace("Waiting for device session to open, deviceId: \(deviceId), current state: \(String(describing: self.deviceSessionState))")
+                        BleLogger.trace("waitDeviceSessionWithPftpToOpen(): current state \(String(describing: self.deviceSessionState))")
                     }
                 }, onError: { error in
-                    BleLogger.trace("Timeout reached while waiting for device session to open, deviceId: \(deviceId)")
+                    BleLogger.error("waitDeviceSessionWithPftpToOpen(): error \(error)")
                     emitter(.error(error))
                 })
             return Disposables.create {
@@ -3139,6 +3143,18 @@ extension PolarBleApiImpl: PolarBleApi  {
             }
         }
     }
+    
+    private func isPftpClientReady(_ identifier: String) -> Bool {
+        do {
+            let session = try self.sessionFtpClientReady(identifier)
+            guard let client = session.fetchGattClient(BlePsFtpClient.PSFTP_SERVICE) as? BlePsFtpClient else {
+                return false
+            }
+            return true
+        } catch _ {
+            return false
+        }
+    }
 
 
     private func processAccData(