diff --git a/src/index.ts b/src/index.ts
index 88d6397..cf7d5a5 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -212,6 +212,7 @@ export default class Updater {
                 return new Promise((resolve, reject) => {
                         this.bleObject.write(this.bleDeviceId, this._updaterServiceUUID, this._updateFileCharacteristicUUID, packet.buffer,
                                 () => {
+                                        this._fileProgress += this._packetSize;
                                         resolve(true);
                                 },
                                 (error) => {
@@ -246,7 +247,7 @@ export default class Updater {
                                         if (dataView[0] == 1) {
                                                 // send file
                                                 await this.sendNextPacket();
-                                                progressCallback(`Sending (${Math.floor((this._fileProgress *100)/this._fileSize)})`);
+                                                progressCallback(`Sending (${Math.floor((this._fileProgress *100)/this._fileSize)}), ${this._fileProgress} / ${this._fileSize}`);
                                         } else if (dataView[0] == 2) {
                                                 // done logic
                                                 if (this._fileProgress >= this._fileSize) {