diff --git a/src/commands/getIsGenuine.js b/src/commands/getIsGenuine.js
index c0b66b8b..c34f4693 100644
--- a/src/commands/getIsGenuine.js
+++ b/src/commands/getIsGenuine.js
@@ -6,11 +6,19 @@ import { fromPromise } from 'rxjs/observable/fromPromise'
 import getIsGenuine from 'helpers/devices/getIsGenuine'
 import { withDevice } from 'helpers/deviceAccess'
 
-type Input = * // FIXME !
+type Input = {
+  devicePath: string,
+  targetId: string | number,
+  version: string,
+}
 type Result = string
 
-const cmd: Command<Input, Result> = createCommand('getIsGenuine', ({ devicePath, targetId }) =>
-  fromPromise(withDevice(devicePath)(transport => getIsGenuine(transport, { targetId }))),
+const cmd: Command<Input, Result> = createCommand(
+  'getIsGenuine',
+  ({ devicePath, targetId, version }) =>
+    fromPromise(
+      withDevice(devicePath)(transport => getIsGenuine(transport, { targetId, version })),
+    ),
 )
 
 export default cmd
diff --git a/src/commands/installMcu.js b/src/commands/installMcu.js
index fcc70eb3..7e49ea16 100644
--- a/src/commands/installMcu.js
+++ b/src/commands/installMcu.js
@@ -9,14 +9,15 @@ import installMcu from 'helpers/firmware/installMcu'
 type Input = {
   devicePath: string,
   targetId: string | number,
+  version: string,
 }
 
 type Result = *
 
-const cmd: Command<Input, Result> = createCommand('installMcu', ({ devicePath, targetId }) =>
-  fromPromise(
-    withDevice(devicePath)(transport => installMcu(transport, { targetId, version: '1.5' })),
-  ),
+const cmd: Command<Input, Result> = createCommand(
+  'installMcu',
+  ({ devicePath, targetId, version }) =>
+    fromPromise(withDevice(devicePath)(transport => installMcu(transport, { targetId, version }))),
 )
 
 export default cmd
diff --git a/src/commands/installOsuFirmware.js b/src/commands/installOsuFirmware.js
index 416badf0..02767210 100644
--- a/src/commands/installOsuFirmware.js
+++ b/src/commands/installOsuFirmware.js
@@ -6,17 +6,22 @@ import { fromPromise } from 'rxjs/observable/fromPromise'
 import { withDevice } from 'helpers/deviceAccess'
 import installOsuFirmware from 'helpers/firmware/installOsuFirmware'
 
+import type { LedgerScriptParams } from 'helpers/common'
+
 type Input = {
   devicePath: string,
-  firmware: Object,
+  targetId: string | number,
+  firmware: LedgerScriptParams,
 }
 
 type Result = *
 
 const cmd: Command<Input, Result> = createCommand(
   'installOsuFirmware',
-  ({ devicePath, firmware }) =>
-    fromPromise(withDevice(devicePath)(transport => installOsuFirmware(transport, firmware))),
+  ({ devicePath, firmware, targetId }) =>
+    fromPromise(
+      withDevice(devicePath)(transport => installOsuFirmware(transport, targetId, firmware)),
+    ),
 )
 
 export default cmd
diff --git a/src/components/ManagerPage/AppsList.js b/src/components/ManagerPage/AppsList.js
index 2333f396..ee87e6a6 100644
--- a/src/components/ManagerPage/AppsList.js
+++ b/src/components/ManagerPage/AppsList.js
@@ -175,8 +175,8 @@ class AppsList extends PureComponent<Props, State> {
   }
 
   renderList() {
-    const { appsList } = this.state
-    return appsList.length > 0 ? (
+    const { appsList, status } = this.state
+    return status === 'idle' ? (
       <Box>
         <AppSearchBar list={appsList}>
           {items => (
diff --git a/src/components/ManagerPage/FirmwareUpdate.js b/src/components/ManagerPage/FirmwareUpdate.js
index c71c75e4..a9ab1e2f 100644
--- a/src/components/ManagerPage/FirmwareUpdate.js
+++ b/src/components/ManagerPage/FirmwareUpdate.js
@@ -10,6 +10,8 @@ import logger from 'logger'
 
 import type { Device, T } from 'types/common'
 
+import type { LedgerScriptParams } from 'helpers/common'
+
 import getLatestFirmwareForDevice from 'commands/getLatestFirmwareForDevice'
 import installOsuFirmware from 'commands/installOsuFirmware'
 
@@ -23,11 +25,6 @@ import UpdateFirmwareButton from './UpdateFirmwareButton'
 
 let CACHED_LATEST_FIRMWARE = null
 
-type FirmwareInfos = {
-  name: string,
-  notes: string,
-}
-
 type DeviceInfos = {
   targetId: number | string,
   version: string,
@@ -40,7 +37,7 @@ type Props = {
 }
 
 type State = {
-  latestFirmware: ?FirmwareInfos,
+  latestFirmware: ?LedgerScriptParams,
 }
 
 class FirmwareUpdate extends PureComponent<Props, State> {
@@ -84,12 +81,13 @@ class FirmwareUpdate extends PureComponent<Props, State> {
   installFirmware = async () => {
     try {
       const { latestFirmware } = this.state
+      const { infos } = this.props
       invariant(latestFirmware, 'did not find a new firmware or firmware is not set')
       const {
         device: { path: devicePath },
       } = this.props
       const { success } = await installOsuFirmware
-        .send({ devicePath, firmware: latestFirmware })
+        .send({ devicePath, firmware: latestFirmware, targetId: infos.targetId })
         .toPromise()
       if (success) {
         this.fetchLatestFirmware()
diff --git a/src/components/ManagerPage/FlashMcu.js b/src/components/ManagerPage/FlashMcu.js
index a9cd2d5a..5edeacd4 100644
--- a/src/components/ManagerPage/FlashMcu.js
+++ b/src/components/ManagerPage/FlashMcu.js
@@ -25,23 +25,30 @@ class FlashMcu extends PureComponent<Props, State> {
     flashing: false,
   }
 
-  componentDidMount() {
-    this.flasMCU()
-  }
-
-  flasMCU = async () => {
+  flashMCU = async () => {
     const { device, deviceInfo } = this.props
     const { flashing } = this.state
 
     if (!flashing) {
-      this.setState(state => ({ ...state, flashing: true }))
-      await installMcu.send({ devicePath: device.path, targetId: deviceInfo.targetId }).toPromise()
-      this.setState(state => ({ ...state, flashing: false }))
+      this.setState({ flashing: true })
+      await installMcu
+        .send({
+          devicePath: device.path,
+          targetId: deviceInfo.targetId,
+          version: deviceInfo.version,
+        })
+        .toPromise()
+      this.setState({ flashing: false })
     }
   }
 
   render() {
-    return <div>Flashing MCU</div>
+    return (
+      <div>
+        <h1>Flashing MCU</h1>
+        <button onClick={this.flashMCU}>flash</button>
+      </div>
+    )
   }
 }
 
diff --git a/src/components/Workflow/EnsureGenuine.js b/src/components/Workflow/EnsureGenuine.js
index 42cb971d..a1890480 100644
--- a/src/components/Workflow/EnsureGenuine.js
+++ b/src/components/Workflow/EnsureGenuine.js
@@ -61,7 +61,7 @@ class EnsureGenuine extends PureComponent<Props, State> {
       this._checking = true
       try {
         const res = await getIsGenuine
-          .send({ devicePath: device.path, targetId: infos.targetId })
+          .send({ devicePath: device.path, targetId: infos.targetId, version: infos.version })
           .pipe(timeout(GENUINE_TIMEOUT))
           .toPromise()
         if (this._unmounting) return
diff --git a/src/helpers/apps/listApps.js b/src/helpers/apps/listApps.js
index 7683158c..21f9ec03 100644
--- a/src/helpers/apps/listApps.js
+++ b/src/helpers/apps/listApps.js
@@ -10,13 +10,14 @@ export default async (targetId: string | number, version: string) => {
     const provider = 1
     const deviceData = await getDeviceVersion(targetId)
     const firmwareData = await getCurrentFirmware({ deviceId: deviceData.id, version })
-    const {
-      data: { application_versions },
-    } = await axios.post(APPLICATIONS_BY_DEVICE, {
+    const params = {
       provider,
       current_se_firmware_final_version: firmwareData.id,
       device_version: deviceData.id,
-    })
+    }
+    const {
+      data: { application_versions },
+    } = await axios.post(APPLICATIONS_BY_DEVICE, params)
     return application_versions.length > 0 ? application_versions : []
   } catch (err) {
     const error = Error(err.message)
diff --git a/src/helpers/devices/getIsGenuine.js b/src/helpers/devices/getIsGenuine.js
index 7cf140fc..4fa98804 100644
--- a/src/helpers/devices/getIsGenuine.js
+++ b/src/helpers/devices/getIsGenuine.js
@@ -1,15 +1,24 @@
 // @flow
-import qs from 'qs'
 import type Transport from '@ledgerhq/hw-transport'
 import { SKIP_GENUINE } from 'config/constants'
 import { WS_GENUINE } from 'helpers/urls'
 
 import { createDeviceSocket } from 'helpers/socket'
+import getCurrentFirmware from './getCurrentFirmware'
+import getDeviceVersion from './getDeviceVersion'
 
 export default async (
   transport: Transport<*>,
-  params: { targetId: string | number },
+  app: { targetId: string | number, version: string },
 ): Promise<string> => {
+  const { targetId, version } = app
+  const device = await getDeviceVersion(app.targetId)
+  const firmware = await getCurrentFirmware({ deviceId: device.id, version })
+  const params = {
+    targetId,
+    version,
+    perso: firmware.perso,
+  }
   const url = WS_GENUINE(params)
   return SKIP_GENUINE
     ? new Promise(resolve => setTimeout(() => resolve('0000'), 1000))
diff --git a/src/helpers/devices/getNextMCU.js b/src/helpers/devices/getNextMCU.js
new file mode 100644
index 00000000..fc246abe
--- /dev/null
+++ b/src/helpers/devices/getNextMCU.js
@@ -0,0 +1,26 @@
+// @flow
+import axios from 'axios'
+
+import { GET_NEXT_MCU } from 'helpers/urls'
+import createCustomErrorClass from 'helpers/createCustomErrorClass'
+
+const LatestMCUInstalledError = createCustomErrorClass('LatestMCUInstalledError')
+
+export default async (bootloaderVersion: string): Promise<*> => {
+  try {
+    const { data } = await axios.post(GET_NEXT_MCU, {
+      bootloader_version: bootloaderVersion,
+    })
+
+    // FIXME: nextVersion will not be able to "default" when Error
+    // handling is standardize on the API side
+    if (data === 'default' || !data.name) {
+      throw new LatestMCUInstalledError('there is no next mcu version to install')
+    }
+    return data
+  } catch (err) {
+    const error = Error(err.message)
+    error.stack = err.stack
+    throw err
+  }
+}
diff --git a/src/helpers/firmware/installMcu.js b/src/helpers/firmware/installMcu.js
index 56fe5448..0c0ceb62 100644
--- a/src/helpers/firmware/installMcu.js
+++ b/src/helpers/firmware/installMcu.js
@@ -1,16 +1,23 @@
 // @flow
-import qs from 'qs'
 import type Transport from '@ledgerhq/hw-transport'
 
-import { MANAGER_API_BASE } from 'config/constants'
+import { WS_MCU } from 'helpers/urls'
 import { createDeviceSocket } from 'helpers/socket'
+import getNextMCU from 'helpers/devices/getNextMCU'
 
 type Result = Promise<*>
 
 export default async (
   transport: Transport<*>,
-  params: { targetId: string | number, version: string },
+  args: { targetId: string | number, version: string },
 ): Result => {
-  const url = `${MANAGER_API_BASE}/mcu?${qs.stringify(params)}`
+  const { version } = args
+  const nextVersion = await getNextMCU(version)
+
+  const params = {
+    targetId: args.targetId,
+    version: nextVersion.name,
+  }
+  const url = WS_MCU(params)
   return createDeviceSocket(transport, url).toPromise()
 }
diff --git a/src/helpers/firmware/installOsuFirmware.js b/src/helpers/firmware/installOsuFirmware.js
index 227ff103..5c8b95ff 100644
--- a/src/helpers/firmware/installOsuFirmware.js
+++ b/src/helpers/firmware/installOsuFirmware.js
@@ -4,13 +4,22 @@ import type Transport from '@ledgerhq/hw-transport'
 import { WS_INSTALL } from 'helpers/urls'
 import { createDeviceSocket } from 'helpers/socket'
 
-type Input = Object
+import type { LedgerScriptParams } from 'helpers/common'
 
 type Result = Promise<{ success: boolean, error?: any }>
 
-export default async (transport: Transport<*>, firmware: Input): Result => {
+export default async (
+  transport: Transport<*>,
+  targetId: string | number,
+  firmware: LedgerScriptParams,
+): Result => {
   try {
-    const url = WS_INSTALL(firmware)
+    const params = {
+      targetId,
+      ...firmware,
+      firmwareKey: firmware.firmware_key,
+    }
+    const url = WS_INSTALL(params)
     await createDeviceSocket(transport, url).toPromise()
     return { success: true }
   } catch (err) {
diff --git a/src/helpers/urls.js b/src/helpers/urls.js
index ea240e6f..a8bc82fb 100644
--- a/src/helpers/urls.js
+++ b/src/helpers/urls.js
@@ -11,11 +11,17 @@ const managerUrlbuilder = urlBuilder(MANAGER_API_BASE)
 const wsURLBuilder = (endpoint: string) => (params?: Object) =>
   `${BASE_SOCKET_URL_SECURE}/${endpoint}${params ? `?${qs.stringify(params)}` : ''}`
 
+// const wsURLBuilderProxy = (endpoint: string) => (params?: Object) =>
+//   `ws://manager.ledger.fr:3501/${endpoint}${params ? `?${qs.stringify(params)}` : ''}`
+
 export const GET_DEVICE_VERSION: string = managerUrlbuilder('get_device_version')
 export const APPLICATIONS_BY_DEVICE: string = managerUrlbuilder('get_apps')
 export const GET_CURRENT_FIRMWARE: string = managerUrlbuilder('get_firmware_version')
 export const GET_LATEST_FIRMWARE: string = managerUrlbuilder('get_latest_firmware')
+export const GET_NEXT_MCU: string = managerUrlbuilder('mcu_versions_bootloader')
 
 export const WS_INSTALL: (arg: LedgerScriptParams) => string = wsURLBuilder('install')
 export const WS_GENUINE: (arg: { targetId: string | number }) => string = wsURLBuilder('genuine')
-export const WS_MCU: (arg: LedgerScriptParams) => string = wsURLBuilder('genuine')
+export const WS_MCU: (arg: { targetId: string | number, version: string }) => string = wsURLBuilder(
+  'mcu',
+)
diff --git a/static/i18n/en/errors.yml b/static/i18n/en/errors.yml
index 2d542878..108a9402 100644
--- a/static/i18n/en/errors.yml
+++ b/static/i18n/en/errors.yml
@@ -19,3 +19,4 @@ WebsocketConnectionFailed: Failed to establish a socket connection
 DeviceSocketFail: Device socket failure
 DeviceSocketNoBulkStatus: Device socket failure (bulk)
 DeviceSocketNoHandler: Device socket failure (handler {{query}})
+LatestMCUInstalledError: The latest MCU is already installed on the Device