diff --git a/Source/Managers/DFU/FirmwareUpgradeManager.swift b/Source/Managers/DFU/FirmwareUpgradeManager.swift
index 7106879..aaee93f 100644
--- a/Source/Managers/DFU/FirmwareUpgradeManager.swift
+++ b/Source/Managers/DFU/FirmwareUpgradeManager.swift
@@ -379,7 +379,7 @@ public class FirmwareUpgradeManager: FirmwareUpgradeController, ConnectionObserv
     private lazy var mcuManagerParametersCallback: McuMgrCallback<McuMgrParametersResponse> = { [weak self] response, error in
         guard let self = self else { return }
         
-        guard error == nil, let response, response.rc != .unsupported else {
+        guard error == nil, let response, response.rc.isSupported() else {
             self.log(msg: "Mcu Manager parameters not supported", atLevel: .warning)
             self.bootloaderInfo() // Continue to Bootloader Info.
             return
@@ -400,7 +400,7 @@ public class FirmwareUpgradeManager: FirmwareUpgradeController, ConnectionObserv
     private lazy var bootloaderInfoCallback: McuMgrCallback<BootloaderInfoResponse> = { [weak self] response, error in
         guard let self else { return }
         
-        guard error == nil, let response, response.rc != .unsupported else {
+        guard error == nil, let response, response.rc.isSupported() else {
             self.log(msg: "Bootloader Info not supported.", atLevel: .warning)
             self.log(msg: "Assuming MCUBoot Bootloader.", atLevel: .debug)
             self.bootloader = .mcuboot
@@ -427,7 +427,7 @@ public class FirmwareUpgradeManager: FirmwareUpgradeController, ConnectionObserv
     private lazy var bootloaderModeCallback: McuMgrCallback<BootloaderInfoResponse> = { [weak self] response, error in
         guard let self else { return }
         
-        guard error == nil, let response, response.rc != .unsupported else {
+        guard error == nil, let response, response.rc.isSupported() else {
             self.log(msg: "Bootloader Mode not supported", atLevel: .warning)
             self.validate() // Continue Upload
             return
diff --git a/Source/Managers/SuitManager.swift b/Source/Managers/SuitManager.swift
index 7814ed6..57a1a0c 100644
--- a/Source/Managers/SuitManager.swift
+++ b/Source/Managers/SuitManager.swift
@@ -121,7 +121,7 @@ public class SuitManager: McuManager {
     private lazy var listManifestCallback: McuMgrCallback<McuMgrManifestListResponse> = { [weak self] response, error in
         guard let self else { return }
         
-        guard error == nil, let response, response.rc != .unsupported else {
+        guard error == nil, let response, response.rc.isSupported() else {
             self.logDelegate?.log("List Manifest Callback not Supported.", ofCategory: .suit, atLevel: .error)
             self.callback?(nil, error)
             return
@@ -141,7 +141,7 @@ public class SuitManager: McuManager {
     
     private lazy var roleStateCallback: McuMgrCallback<McuMgrManifestStateResponse> = { [weak self] response, error in
         guard let self else { return }
-        guard error == nil, let response, response.rc != .unsupported else {
+        guard error == nil, let response, response.rc.isSupported() else {
             self.logDelegate?.log("List Manifest Callback not Supported.", ofCategory: .suit, atLevel: .error)
             return
         }
@@ -297,8 +297,8 @@ public class SuitManager: McuManager {
         }
         
         if let response {
-            guard response.rc != .unsupported else {
-                // Not supported, so either no polling or device restarted.
+            guard response.rc.isSupported() else {
+                // Not supported, so either no polling, or device restarted.
                 // It means success / continue.
                 self.uploadDelegate?.uploadDidFinish()
                 return
diff --git a/Source/McuManager.swift b/Source/McuManager.swift
index 7cd0876..ec6ea66 100644
--- a/Source/McuManager.swift
+++ b/Source/McuManager.swift
@@ -468,6 +468,15 @@ public enum McuMgrReturnCode: UInt64, Error {
         return self == .ok
     }
     
+    public func isSupported() -> Bool {
+        switch self {
+        case .unsupported, .unsupportedTooOld, .unsupportedTooNew:
+            return false
+        default:
+            return true
+        }
+    }
+    
     public func isError() -> Bool {
         return self != .ok
     }