diff --git a/src/index.ts b/src/index.ts
index e5e307f..0b54b53 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -211,7 +211,7 @@ export default class Updater {
                 let packet = this.file.slice(this._fileProgress, this._fileProgress+this._packetSize);
                 this._fileProgress += this._packetSize;
                 return new Promise((resolve, reject) => {
-                        this.bleObject.write(this.bleDeviceId, this._updaterServiceUUID, this._updateFileCharacteristicUUID, packet.buffer,
+                        this.bleObject.writeWithoutResponse(this.bleDeviceId, this._updaterServiceUUID, this._updateFileCharacteristicUUID, packet.buffer,
                                 () => {
                                         resolve(true);
                                 },
@@ -239,15 +239,15 @@ export default class Updater {
                 // check for error
 
                 // write file length
-                return new Promise(async (resolve, reject) => {
+                return new Promise((resolve, reject) => {
                         // start notify
                         this.bleObject.startNotification(this.bleDeviceId, this._updaterServiceUUID, this._updaterCommandCharacterisitcUUID,
-                                async (rawData: ArrayBuffer): Promise<void> => {
+                                (rawData: ArrayBuffer): void => {
                                         let dataView = new Uint8Array(rawData);
                                         console.log(dataView);
                                         if (dataView[0] == 1) {
                                                 // send file
-                                                await this.sendNextPacket();
+                                                this.sendNextPacket();
                                                 progressCallback(`Sending (${Math.floor((this._fileProgress *100)/this._fileSize)}%), ${this._fileProgress} / ${this._fileSize}`);
                                         } else if (dataView[0] == 2) {
                                                 // done logic
@@ -255,7 +255,7 @@ export default class Updater {
                                                 if (this._fileProgress >= this._fileSize) {                                     
                                                         console.log("true");           
                                                         // send agree
-                                                        await this.sendEndCmd(true);
+                                                        this.sendEndCmd(true);
                                                         progressCallback(`Complete!`);
                                                         this.bleObject.stopNotification(this.bleDeviceId, 
                                                                 this._updaterServiceUUID, this._updaterCommandCharacterisitcUUID,
@@ -270,7 +270,7 @@ export default class Updater {
                                                 } else {
                                                         console.log("False");
                                                         // send disagree
-                                                        await this.sendEndCmd(false);
+                                                        this.sendEndCmd(false);
                                                         progressCallback(`Error, starting over: ${this._fileProgress} / ${this._fileSize}`);
                                                         this._fileProgress = 0;
                                                 }
@@ -294,7 +294,7 @@ export default class Updater {
                         const buffer = new ArrayBuffer(4)
                         let view = new Int32Array(buffer);
                         view[0] = this._fileSize;
-                        await this.bleObject.withPromises.write(this.bleDeviceId, this._updaterServiceUUID, this._updaterCommandCharacterisitcUUID, buffer);                 
+                        this.bleObject.withPromises.write(this.bleDeviceId, this._updaterServiceUUID, this._updaterCommandCharacterisitcUUID, buffer);                 
                 });
         }
 }