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b. Manual Update
You can also go to the ASUS Official Website to download newer firmware and
instruction manuals.
Note:
 Please make sure the firmware SKU you download conforms to what is on your
phone, e.g., WW -> WW, CN -> CN, TW -> TW. Using an incorrect SKU will lead to an
update failure.
 You can not change the SKU from one to another, e.g., WW -> TW, and you can not
downgrade the firmware either, e.g., V2.20.40.13 -> V2.19.40.18.
 During update process, please charge your phone with the AC adaptor or make
sure the phone has at least 15% battery life available.
Steps for update:
1. Go to the "Support Center" page of the ASUS Official
Website https://www.asus.com/support to download the ZIP file of the needed
firmware.
2. Put the ZIP file in the root directory of the phone's internal storage.
2-1. Download by Phone/Pad：Please select the download path to the root
directory of the phone's internal storage (or copy/move from default download