diff --git a/packages/uhk-usb/src/constants.ts b/packages/uhk-usb/src/constants.ts
index 4b8fb25d..ae602e3b 100644
--- a/packages/uhk-usb/src/constants.ts
+++ b/packages/uhk-usb/src/constants.ts
@@ -8,17 +8,22 @@ export namespace Constants {
  * UHK USB Communications command. All communication package should have start with a command code.
  */
 export enum UsbCommand {
-    GetProperty = 0,
-    Reenumerate = 1,
+    GetProperty              = 0x00,
+    Reenumerate              = 0x01,
+    JumpToModuleBootloader   = 0x02,
+    SendKbootCommandToModule = 0x03,
+    ReadConfig               = 0x04,
     UploadUserConfig = 8,
     ApplyConfig = 9,
     LaunchEepromTransfer = 12,
-    ReadHardwareConfig = 13,
     WriteHardwareConfig = 14,
-    ReadUserConfig = 15,
-    GetKeyboardState = 16,
-    JumpToModuleBootloader = 0x02,
-    SendKbootCommandToModule = 0x03
+    GetKeyboardState = 16
+}
+
+export enum ConfigBufferId {
+    hardwareConfig = 0,
+    stagingUserConfig = 1,
+    validatedUserConfig = 2
 }
 
 export enum EepromTransfer {
diff --git a/packages/uhk-usb/src/uhk-operations.ts b/packages/uhk-usb/src/uhk-operations.ts
index e2b23525..dca4ba84 100644
--- a/packages/uhk-usb/src/uhk-operations.ts
+++ b/packages/uhk-usb/src/uhk-operations.ts
@@ -5,7 +5,8 @@ import * as fs from 'fs';
 import { UhkBlhost } from './uhk-blhost';
 import { UhkHidDevice } from './uhk-hid-device';
 import { snooze } from './util';
-import { convertBufferToIntArray, EepromTransfer, getTransferBuffers, SystemPropertyIds, UsbCommand } from '../index';
+import { convertBufferToIntArray, EepromTransfer, getTransferBuffers, SystemPropertyIds, UsbCommand, ConfigBufferId
+       } from '../index';
 import { LoadConfigurationsResult } from './models/load-configurations-result';
 
 export class UhkOperations {
@@ -69,12 +70,12 @@ export class UhkOperations {
             await this.device.waitUntilKeyboardBusy();
             const userConfiguration = await this.loadConfiguration(
                 SystemPropertyIds.MaxUserConfigSize,
-                UsbCommand.ReadUserConfig,
+                ConfigBufferId.validatedUserConfig,
                 'user configuration');
 
             const hardwareConfiguration = await this.loadConfiguration(
                 SystemPropertyIds.HardwareConfigSize,
-                UsbCommand.ReadHardwareConfig,
+                ConfigBufferId.hardwareConfig,
                 'hardware configuration');
 
             return {
@@ -90,7 +91,10 @@ export class UhkOperations {
      * Return with the actual user / hardware fonfiguration from UHK Device
      * @returns {Promise<Buffer>}
      */
-    public async loadConfiguration(property: SystemPropertyIds, config: UsbCommand, configName: string): Promise<string> {
+    public async loadConfiguration(
+        property: SystemPropertyIds,
+        configBufferId: ConfigBufferId ,
+        configName: string): Promise<string> {
         let response = [];
 
         try {
@@ -106,12 +110,13 @@ export class UhkOperations {
             this.logService.debug(`[DeviceOperation] USB[T]: Read ${configName} from keyboard`);
             while (offset < configSize) {
                 const chunkSizeToRead = Math.min(chunkSize, configSize - offset);
-                const writeBuffer = Buffer.from([config, chunkSizeToRead, offset & 0xff, offset >> 8]);
+                const writeBuffer = Buffer.from(
+                    [UsbCommand.ReadConfig, configBufferId, chunkSizeToRead, offset & 0xff, offset >> 8]);
                 const readBuffer = await this.device.write(writeBuffer);
                 configBuffer = Buffer.concat([configBuffer, new Buffer(readBuffer.slice(1, chunkSizeToRead + 1))]);
                 offset += chunkSizeToRead;
 
-                if (firstRead && config === UsbCommand.ReadUserConfig) {
+                if (firstRead && configBufferId !== ConfigBufferId.hardwareConfig) {
                     firstRead = false;
                     configSize = readBuffer[7] + (readBuffer[8] << 8);
                     this.logService.debug(`[DeviceOperation] userConfigSize: ${configSize}`);
diff --git a/packages/usb/read-config.js b/packages/usb/read-config.js
index fbe2c518..d3969882 100755
--- a/packages/usb/read-config.js
+++ b/packages/usb/read-config.js
@@ -23,10 +23,10 @@ device.write(uhk.getTransferData(payload));
 let buffer = Buffer.from(device.readSync());
 configSize = buffer[1] + (buffer[2]<<8);
 console.log(`${configTypeString}configSize:`, configSize);
-while(offset < configSize) {
-    const usbCommand = isHardwareConfig ? uhk.usbCommands.readHardwareConfig : uhk.usbCommands.readUserConfig;
+while (offset < configSize) {
+    const configBufferId = isHardwareConfig ? uhk.configBufferIds.hardwareConfig : uhk.configBufferIds.validatedUserConfig;
     chunkSizeToRead = Math.min(chunkSize, configSize - offset);
-    buffer = Buffer.from([usbCommand, chunkSizeToRead, offset & 0xff, offset >> 8]);
+    buffer = Buffer.from([uhk.usbCommands.readConfig, configBufferId, chunkSizeToRead, offset & 0xff, offset >> 8]);
     console.log('write to keyboard', uhk.bufferToString(buffer));
     device.write(uhk.getTransferData(buffer));
     buffer = Buffer.from(device.readSync());
diff --git a/packages/usb/uhk.js b/packages/usb/uhk.js
index 8f3a3b34..52dc06c5 100644
--- a/packages/usb/uhk.js
+++ b/packages/usb/uhk.js
@@ -51,21 +51,20 @@ exports = module.exports = moduleExports = {
     getTransferData,
     checkModuleSlot,
     usbCommands: {
-        getProperty: 0,
-        reenumerate: 1,
+        getProperty             : 0x00,
+        reenumerate             : 0x01,
+        jumpToModuleBootloader  : 0x02,
+        sendKbootCommandToModule: 0x03,
+        readConfig              : 0x04,
         setTestLed: 0x14,
         writeUserConfig: 8,
         applyConfig: 9,
         setLedPwmBrightness: 10,
         getAdcValue: 11,
         launchEepromTransferLegacy: 12,
-        readHardwareConfig: 13,
         writeHardwareConfig: 14,
-        readUserConfig: 15,
         getKeyboardState: 16,
         getDebugInfo: 17,
-        jumpToModuleBootloader: 0x02,
-        sendKbootCommandToModule: 0x03,
     },
     enumerationModes: {
         bootloader: 0,
@@ -94,6 +93,11 @@ exports = module.exports = moduleExports = {
         hardwareConfigSize: 4,
         userConfigSize: 5,
     },
+    configBufferIds: {
+        hardwareConfig: 0,
+        stagingUserConfig: 1,
+        validatedUserConfig: 2,
+    },
     eepromTransfer: {
         readHardwareConfig: 0,
         writeHardwareConfig: 1,