- You'll need a Google Play edition HTC One running 100 percent stock Android 4.3 firmware — build JWR66Y.H1 — check under Settings > About phone > Build number.
- This won't work on the HTC One with HTC Sense UI, so don't try it on that device.
- Make sure you have a reasonable amount of battery charge remaining — at least 50 percent.
- Although this is easier than the usual sideloading method it's still worth exercising some caution, and remember that you proceed at your own risk.
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- From your phone, click the link below to download the over-the-air update package directly from Google. Download(320MB).
- When it's done, shut down your phone and disconnect any cables.
- Hold your volume down and power keys until the bootloader starts up. (You should see colored text on a black screen.
- Using the volume keys, navigate down to RECOVERY and press power.
- Wait until the icon has stopped spinning and you see the android with the red exclamation mark above it.
- First hold volume up, then (with volume up held down) press power to enter the main recovery menu.
- Navigate down to "apply from phone storage" and press power to select.
- Navigate down to "0/", then "Download/", then select the file you downloaded in step 1 (the one starting "545beb").
- Let the updater do its thing — it may take a few minutes — then when you see the message "Neet (sic) to Reboot to flash firmware.zip", select "Reboot system now" from the menu and press the power button.
- Wait for the update to finalize and enjoy Android 4.4 KitKat on your Google Play edition HTC One!