diff --git a/android/src/main/java/com/pilloxa/dfu/RNNordicDfuModule.java b/android/src/main/java/com/pilloxa/dfu/RNNordicDfuModule.java
index 39a0347..5212d93 100644
--- a/android/src/main/java/com/pilloxa/dfu/RNNordicDfuModule.java
+++ b/android/src/main/java/com/pilloxa/dfu/RNNordicDfuModule.java
@@ -1,4 +1,3 @@
-
 package com.pilloxa.dfu;
 
 import android.app.NotificationManager;
@@ -45,15 +44,31 @@ public void startDFU(String address, String name, String filePath, int packetRec
           int mtu = options.getInt("maxMtu");
           starter.setMtu(mtu);
         }
+
+        // NEW: Add forceDfu option for Legacy DFU bootloaders (like Adafruit)
+        if (options.hasKey("forceDfu")) {
+          boolean forceDfu = options.getBoolean("forceDfu");
+          if (forceDfu) {
+            starter.setForceDfu(true);
+            Log.d(LOG_TAG, "Force DFU mode enabled (Legacy DFU)");
+          }
+        }
+
         if (name != null) {
             starter.setDeviceName(name);
         }
-          // mimic behavior of iOSDFULibrary when packetReceiptNotificationParameter is set to `0` - see: https://github.com/NordicSemiconductor/IOS-Pods-DFU-Library/blob/master/iOSDFULibrary/Classes/Implementation/DFUServiceInitiator.swift#L115
+
+        // mimic behavior of iOSDFULibrary when packetReceiptNotificationParameter is set to `0` - see: https://github.com/NordicSemiconductor/IOS-Pods-DFU-Library/blob/master/iOSDFULibrary/Classes/Implementation/DFUServiceInitiator.swift#L115
         if (packetReceiptNotificationParameter > 0) {
+          starter.setPacketsReceiptNotificationsEnabled(true);
           starter.setPacketsReceiptNotificationsValue(packetReceiptNotificationParameter);
+          Log.d(LOG_TAG, "PRN enabled with value: " + packetReceiptNotificationParameter);
         } else {
+          starter.setPacketsReceiptNotificationsEnabled(true);
           starter.setPacketsReceiptNotificationsValue(1);
+          Log.d(LOG_TAG, "PRN set to default value: 1");
         }
+
         starter.setUnsafeExperimentalButtonlessServiceInSecureDfuEnabled(true);
         if (filePath.endsWith(".bin") || filePath.endsWith(".hex")) {
             starter.setBinOrHex(DfuBaseService.TYPE_APPLICATION, filePath).setInitFile(null, null);
@@ -61,6 +76,7 @@ public void startDFU(String address, String name, String filePath, int packetRec
             starter.setZip(filePath);
         }
       
+        Log.d(LOG_TAG, "Starting DFU for device: " + address + " with file: " + filePath);
         final DfuServiceController controller = starter.start(this.reactContext, DfuService.class);
     }
 
@@ -199,4 +215,4 @@ public void onError(final String deviceAddress, final int error, final int error
             }
         }
     };
-}
+}
\ No newline at end of file
diff --git a/index.d.ts b/index.d.ts
index a7f4b3d..9fe542d 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -1,5 +1,18 @@
 declare module "react-native-nordic-dfu" {
   export class NordicDFU {
+    /**
+     * Start the DFU process
+     * @param config - DFU configuration object
+     * @param config.deviceAddress - Device MAC address (Android) or UUID (iOS)
+     * @param config.deviceName - Optional device name for notification
+     * @param config.filePath - Path to firmware .zip file
+     * @param config.alternativeAdvertisingNameEnabled - iOS only: Send unique name before bootloader mode (default: true)
+     * @param config.packetReceiptNotificationParameter - PRN value: Lower (1-6) = slower/reliable, Higher (10-15) = faster. Use 1 for Legacy DFU. (default: 12)
+     * @param config.retries - Android only: Number of connection retries (default: 3)
+     * @param config.maxMtu - Android only: Maximum MTU size (default: 23)
+     * @param config.forceDfu - Android only: Force DFU mode for Legacy DFU bootloaders like Adafruit (default: false)
+     * @returns Promise that resolves with device address on success
+     */
     static startDFU({
       deviceAddress,
       deviceName,
@@ -8,6 +21,7 @@ declare module "react-native-nordic-dfu" {
       packetReceiptNotificationParameter,
       retries,
       maxMtu,
+      forceDfu,
     }: {
       deviceAddress: string;
       deviceName?: string;
@@ -16,6 +30,7 @@ declare module "react-native-nordic-dfu" {
       packetReceiptNotificationParameter?: number;
       retries?: number;
       maxMtu?: number;
+      forceDfu?: boolean;
     }): Promise<string>;
   }
 
@@ -36,4 +51,4 @@ declare module "react-native-nordic-dfu" {
 
     static removeAllListeners(name: "DFUProgress" | "DFUStateChanged"): void;
   }
-}
+}
\ No newline at end of file
diff --git a/index.js b/index.js
index 3ad12b9..1efe7c1 100644
--- a/index.js
+++ b/index.js
@@ -25,7 +25,10 @@ function rejectPromise(message) {
  * @param {string} [obj.deviceName = null] The name of the device in the update notification
  * @param {string} obj.filePath The file system path to the zip-file used for updating
  * @param {Boolean} obj.alternativeAdvertisingNameEnabled Send unique name to device before it is switched into bootloader mode (iOS only)
- * @param {number} obj.packetReceiptNotificationParameter set number of packets of firmware data to be received by the DFU target before sending a new Packet Receipt Notification
+ * @param {number} obj.packetReceiptNotificationParameter Set number of packets of firmware data to be received by the DFU target before sending a new Packet Receipt Notification. Lower values (1-6) = slower but more reliable. Higher values (10-15) = faster. Use 1 for problematic Legacy DFU bootloaders.
+ * @param {number} obj.retries Number of connection retries (Android only, default: 3)
+ * @param {number} obj.maxMtu Maximum MTU size (Android only, default: 23)
+ * @param {Boolean} obj.forceDfu Force DFU mode - required for Legacy DFU bootloaders like Adafruit (Android only, default: false)
  * @returns {Promise} A promise that resolves or rejects with the `deviceAddress` in the return value
  *
  * @example
@@ -34,7 +37,9 @@ function rejectPromise(message) {
  * NordicDFU.startDFU({
  *   deviceAddress: "C3:53:C0:39:2F:99",
  *   deviceName: "Pilloxa Pillbox",
- *   filePath: "/data/user/0/com.nordicdfuexample/files/RNFetchBlobTmp4of.zip"
+ *   filePath: "/data/user/0/com.nordicdfuexample/files/RNFetchBlobTmp4of.zip",
+ *   packetReceiptNotificationParameter: 1, // Use 1 for Adafruit boards
+ *   forceDfu: true // Enable for Legacy DFU bootloaders
  * })
  *   .then(res => console.log("Transfer done:", res))
  *   .catch(console.log);
@@ -47,6 +52,7 @@ function startDFU({
   packetReceiptNotificationParameter = 12,
   retries = 3, // Android only
   maxMtu = 23, // Android only
+  forceDfu = false, // Android only - NEW: for Legacy DFU bootloaders
 }) {
   if (deviceAddress == undefined) {
     return rejectPromise("No deviceAddress defined");
@@ -72,6 +78,7 @@ function startDFU({
       {
         retries,
         maxMtu,
+        forceDfu, // NEW: Pass forceDfu to native module
       }
     );
   } else {
@@ -97,4 +104,4 @@ function startDFU({
  */
 const DFUEmitter = new NativeEventEmitter(RNNordicDfu);
 
-export { NordicDFU, DFUEmitter };
+export { NordicDFU, DFUEmitter };
\ No newline at end of file