diff --git a/src/actions/bootloader.ts b/src/actions/bootloader.ts
index 0823c22b..9ef6747a 100644
--- a/src/actions/bootloader.ts
+++ b/src/actions/bootloader.ts
@@ -75,10 +75,14 @@ export function didError(err: Error): BootloaderConnectionDidErrorAction {
 export interface BootloaderConnectionSendAction
     extends Action<BootloaderConnectionActionType.Send> {
     readonly data: ArrayBuffer;
+    readonly withResponse: boolean;
 }
 
-export function send(data: ArrayBuffer): BootloaderConnectionSendAction {
-    return { type: BootloaderConnectionActionType.Send, data };
+export function send(
+    data: ArrayBuffer,
+    withResponse = false,
+): BootloaderConnectionSendAction {
+    return { type: BootloaderConnectionActionType.Send, data, withResponse };
 }
 
 export interface BootloaderConnectionDidSendAction
diff --git a/src/services/bootloader.ts b/src/services/bootloader.ts
index 674e5f74..3cf994d5 100644
--- a/src/services/bootloader.ts
+++ b/src/services/bootloader.ts
@@ -81,7 +81,17 @@ async function send(action: Action, dispatch: Dispatch): Promise<void> {
         if (!char) {
             throw Error('Not connected');
         }
-        await char.writeValue((action as BootloaderConnectionSendAction).data);
+        const sendAction = action as BootloaderConnectionSendAction;
+        // Fall back to legacy WebBluetooth writeValue if new methods are not
+        // available.
+        const writeValue = sendAction.withResponse
+            ? // eslint-disable-next-line @typescript-eslint/ban-ts-ignore
+              // @ts-ignore
+              char.writeValueWithResponse || char.writeValue
+            : // eslint-disable-next-line @typescript-eslint/ban-ts-ignore
+              // @ts-ignore
+              char.writeValueWithoutResponse || char.writeValue;
+        await writeValue(sendAction.data);
         dispatch(didSend());
     } catch (err) {
         dispatch(didSend(err));