diff --git a/src/flowtype/index.js b/src/flowtype/index.js
index a66b4135..7de58c39 100644
--- a/src/flowtype/index.js
+++ b/src/flowtype/index.js
@@ -53,11 +53,13 @@ export type TrezorDevice = {
     instanceLabel: string;
     instanceName: ?string;
     features?: Features;
-    unacquired?: boolean;
-    isUsedElsewhere?: boolean;
+    // unacquired?: boolean; // device.type === 'unacquired' && device.type !== 'unreadable'
+    // isUsedElsewhere?: boolean; // device.status === 'occupied'
+    type: 'acquired' | 'unacquired' | 'unreadable';
+    status: 'available' | 'occupied' | 'used';
     featuresNeedsReload?: boolean;
     ts: number;
-}
+};
 
 export type RouterLocationState = LocationState;
 
diff --git a/src/js/actions/TrezorConnectActions.js b/src/js/actions/TrezorConnectActions.js
index 28c35b8d..eb7c64b6 100644
--- a/src/js/actions/TrezorConnectActions.js
+++ b/src/js/actions/TrezorConnectActions.js
@@ -169,7 +169,7 @@ export const postInit = (): ThunkAction => (dispatch: Dispatch, getState: GetSta
                 } else {
 
         if (devices.length > 0) {
-            const unacquired: ?TrezorDevice = devices.find(d => d.unacquired);
+            const unacquired: ?TrezorDevice = devices.find(d => d.type === 'unacquired');
             if (unacquired) {
                 dispatch( onSelectDevice(unacquired) );
             } else {
@@ -260,7 +260,7 @@ export const switchToFirstAvailableDevice = (): AsyncAction => async (dispatch:
         // 1. First Unacquired
         // 2. First connected
         // 3. Saved with latest timestamp
-        const unacquired = devices.find(d => d.unacquired);
+        const unacquired = devices.find(d => d.type === 'unacquired');
         if (unacquired) {
             dispatch(initConnectedDevice(unacquired));
         } else {
diff --git a/src/js/components/wallet/aside/DeviceSelection.js b/src/js/components/wallet/aside/DeviceSelection.js
index 443e37dc..eeae1b90 100644
--- a/src/js/components/wallet/aside/DeviceSelection.js
+++ b/src/js/components/wallet/aside/DeviceSelection.js
@@ -26,11 +26,11 @@ export const DeviceSelect = (props: Props) => {
         css += ' unavailable';
         deviceStatus = 'Unavailable';
     } else {
-        if (selected.unacquired) {
+        if (selected.type === 'unacquired') {
             css += ' unacquired';
             deviceStatus = 'Used in other window';
         }
-        if (selected.isUsedElsewhere) {
+        if (selected.status === 'occupied') {
             css += ' used-elsewhere';
             deviceStatus = 'Used in other window';
         } else if (selected.featuresNeedsReload) {
@@ -147,7 +147,7 @@ export class DeviceDropdown extends Component<Props> {
         if (selected.features) {
             const deviceMenuItems: Array<DeviceMenuItem> = [];
 
-            if (selected.isUsedElsewhere) {
+            if (selected.status === 'occupied') {
                 deviceMenuItems.push({ type: 'reload', label: 'Renew session' });
             } else if (selected.featuresNeedsReload) {
                 deviceMenuItems.push({ type: 'reload', label: 'Renew session' });
@@ -177,7 +177,7 @@ export class DeviceDropdown extends Component<Props> {
 
             let deviceStatus: string = 'Connected';
             let css: string = 'device item';
-            if (dev.unacquired || dev.isUsedElsewhere) {
+            if (dev.type === 'unacquired' || dev.status === 'occupied') {
                 deviceStatus = 'Used in other window';
                 css += ' unacquired';
             } else if (!dev.connected) {
diff --git a/src/js/reducers/DevicesReducer.js b/src/js/reducers/DevicesReducer.js
index a3d0f672..d96ffc67 100644
--- a/src/js/reducers/DevicesReducer.js
+++ b/src/js/reducers/DevicesReducer.js
@@ -44,8 +44,8 @@ const mergeDevices = (current: TrezorDevice, upcoming: Device | TrezorDevice): T
     };
     // corner-case: trying to merge unacquired device with acquired
     // make sure that sensitive fields will not be changed and device will remain acquired
-    if (upcoming.unacquired && current.state) {
-        dev.unacquired = false;
+    if (upcoming.type === 'unacquired' && current.state) {
+        dev.type = 'unacquired';
         dev.features = current.features;
         dev.label = current.label;
     }
@@ -184,7 +184,8 @@ const devicesFromStorage = (devices: Array<TrezorDevice>): State => devices.map(
     path: '',
     acquiring: false,
     featuresNeedsReload: false,
-    isUsedElsewhere: false,
+    //isUsedElsewhere: false,
+    status: 'available',
 }));
 
 // Remove all device reference from State
@@ -204,11 +205,11 @@ const disconnectDevice = (state: State, device: Device): State => {
     const otherDevices: State = state.filter(d => affectedDevices.indexOf(d) === -1);
 
     if (affectedDevices.length > 0) {
-        const acquiredDevices = affectedDevices.filter(d => !d.unacquired && d.state);
+        const acquiredDevices = affectedDevices.filter(d => d.type !== 'unacquired' && d.type !== 'unreadable' && d.state);
         return otherDevices.concat(acquiredDevices.map((d) => {
             d.connected = false;
             d.available = false;
-            d.isUsedElsewhere = false;
+            d.status = 'used';
             d.featuresNeedsReload = false;
             d.path = '';
             return d;
diff --git a/src/js/reducers/utils/index.js b/src/js/reducers/utils/index.js
index 26fb3761..11b5020d 100644
--- a/src/js/reducers/utils/index.js
+++ b/src/js/reducers/utils/index.js
@@ -30,7 +30,7 @@ export const getSelectedDevice = (state: State): ?TrezorDevice => {
 
     const instance: ?number = locationState.deviceInstance ? parseInt(locationState.deviceInstance) : undefined;
     return state.devices.find((d) => {
-        if (d.unacquired && d.path === locationState.device) {
+        if (d.type === 'unacquired' && d.path === locationState.device) {
             return true;
         } if (d.features && d.features.bootloader_mode && d.path === locationState.device) {
             return true;