diff --git a/src/utils/qdl.js b/src/utils/qdl.js
index a4b4001..509bd4b 100644
--- a/src/utils/qdl.js
+++ b/src/utils/qdl.js
@@ -4,7 +4,6 @@ import * as Comlink from 'comlink'
 
 import { getManifest } from './manifest'
 import { withProgress } from './progress'
-import { Timer } from './timer'
 
 export const Step = {
   INITIALIZING: 0,
@@ -88,7 +87,6 @@ export class QdlManager {
     this.manifest = null
     this.step = Step.INITIALIZING
     this.error = Error.NONE
-    this.timer = new Timer()
   }
 
   /**
@@ -123,8 +121,6 @@ export class QdlManager {
    * @param {number} error
    */
   setError(error) {
-    const errorName = Object.keys(Error).find((key) => Error[key] === error)?.toLowerCase()
-    this.timer.stop(`error:${errorName || error}`)
     this.error = error
     this.callbacks.onErrorChange?.(error)
     this.setProgress(-1)
@@ -139,7 +135,6 @@ export class QdlManager {
    * @param {boolean} connected
    */
   setConnected(connected) {
-    if (connected) this.timer.start()
     this.callbacks.onConnectionChange?.(connected)
   }
 
@@ -252,7 +247,6 @@ export class QdlManager {
       for await (const [image, onProgress] of withProgress(this.manifest, this.setProgress.bind(this))) {
         this.setMessage(`Downloading ${image.name}`)
         await this.imageWorker.downloadImage(image, Comlink.proxy(onProgress))
-        this.timer.mark(`download:${image.name}`)
       }
 
       console.debug('[QDL] Downloaded all images')
@@ -276,12 +270,10 @@ export class QdlManager {
 
     try {
       const currentSlot = await this.qdl.getActiveSlot()
-      this.timer.mark('get-active-slot')
       const otherSlot = currentSlot === 'a' ? 'b' : 'a'
 
       // Erase current xbl partition
       await this.qdl.erase(`xbl_${currentSlot}`)
-      this.timer.mark(`erase-xbl:${currentSlot}`)
 
       const steps = []
       const findImage = (name) => this.manifest.find((it) => it.name === name)
@@ -303,13 +295,11 @@ export class QdlManager {
         const blob = await fileHandle.getFile()
         this.setMessage(`Flashing ${partitionName}`)
         await this.qdl.flashBlob(partitionName, blob, onProgress)
-        this.timer.mark(`flash-blob:${partitionName}`)
       }
 
       console.debug('[QDL] Flashed all partitions')
       this.setMessage(`Changing slot to ${otherSlot}`)
       await this.qdl.setActiveSlot(otherSlot)
-      this.timer.mark(`set-active-slot:${otherSlot}`)
 
       this.setStep(Step.ERASING)
     } catch (err) {
@@ -330,12 +320,10 @@ export class QdlManager {
       const label = new Uint8Array(28).fill(0)  // sparse header size
       label.set(new TextEncoder().encode('COMMA_RESET'), 0)
       await this.qdl.flashBlob('userdata', new Blob([label]))
-      this.timer.mark('flash-blob:userdata')
       this.setProgress(0.9)
 
       this.setMessage('Rebooting')
       await this.qdl.reset()
-      this.timer.mark('reset')
       this.setProgress(1)
       this.setConnected(false)
 
@@ -355,13 +343,9 @@ export class QdlManager {
     await this.connect()
     if (this.error !== Error.NONE) return
     await this.downloadImages()
-    this.timer.mark('step:download-images')
     if (this.error !== Error.NONE) return
     await this.flashDevice()
-    this.timer.mark('step:flash-device')
     if (this.error !== Error.NONE) return
     await this.eraseDevice()
-    this.timer.mark('step:erase-device')
-    this.timer.stop('complete')
   }
 }
diff --git a/src/utils/timer.js b/src/utils/timer.js
deleted file mode 100644
index 24f3688..0000000
--- a/src/utils/timer.js
+++ /dev/null
@@ -1,36 +0,0 @@
-export class Timer {
-  /** @type {number|null} */
-  startTime = null
-
-  /** @type {Object.<string, number>} */
-  stepTimestamps = {}
-
-  start() {
-    this.startTime = performance.now()
-    this.stepTimestamps = {}
-    this.mark('start')
-  }
-
-  /**
-   * @param {string} step
-   */
-  mark(step) {
-    if (!this.startTime) return
-    const now = performance.now()
-    this.stepTimestamps[step] = now
-    console.info(`[Timer] ${step} at ${((now - this.startTime) / 1000).toFixed(2)}s`)
-  }
-
-  /**
-   * @param {string} reason
-   */
-  stop(reason) {
-    if (!this.startTime) return null
-    this.mark(reason)
-    console.debug({
-      reason,
-      totalDuration: this.stepTimestamps[reason],
-      steps: this.stepTimestamps,
-    })
-  }
-}
diff --git a/src/workers/image.worker.js b/src/workers/image.worker.js
index 516a6e7..bfb4df1 100644
--- a/src/workers/image.worker.js
+++ b/src/workers/image.worker.js
@@ -52,7 +52,7 @@ const imageWorker = {
   async init() {
     if (!root) {
       root = await navigator.storage.getDirectory()
-      // await root.remove({ recursive: true })
+      await root.remove({ recursive: true })
       console.info('[ImageWorker] Initialized')
     }
 
@@ -74,14 +74,6 @@ const imageWorker = {
   async downloadImage(image, onProgress = undefined) {
     const { archiveUrl, checksum: expectedChecksum, fileName, size } = image
 
-    // Skip if already downloaded
-    try {
-      await root.getFileHandle(fileName)
-      return
-    } catch {
-      // ignored
-    }
-
     let writable
     try {
       const fileHandle = await root.getFileHandle(fileName, { create: true })