Install Android 5.0 Lollipop OTA Update on Asus ZenFone 4 Manually (Guide)

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Asus has released the long-awaited Android 5.0 Lollipop OTA update for the ZenFone 4 T00I. You will receive the OTA (over the air) update notification on your device in the coming weeks or install the update manually. To get the Lollipop update (software version 7.3.3) on your ZenFone 4, your phone should be on software version 6.3.3.

Today’s guide shows you how to download and install Android 5.0 Lollipop OTA update manually on ZenFone 4 T00I. The Lollipop update brings new features like the new lockscreen, revamped Dialer and Contacts app, performance improvements and extended battery life to your ZenFone 4. You will also get Asus Auto-start Service Manager, improved VOIP phone call function, improved music function, and more.

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If you cannot wait Asus to officially release the Android 5.0 Lollipop OTA update for your ZenFone 4, read on to know how to update it manually.

How to Install Android 5.0 Lollipop Update on Asus Zenfone 4

Important: This guide is only for Asus ZenFone 4 (T00I) variant. It will not work on other ZenFone 4 variant. Please note that installing incorrect firmware will brick the device.

Also, please make sure your current software version is 6.3.3 before update to version V7.3.3. If not, update it first and follow the instruction below.

1. Download [HERE] official Android 5.0 Lollipop OTA update for ZenFone 4 T00I (UL-ASUS_T00I-WW-7.3.3.0-user.zip). Download size 779MB.

2. Connect your phone to the computer using USB cable and then transfer the downloaded file to internal memory of your phone.

3. Disconnect the phone from the computer. After sometime, you will get a notification at notification bar.

4. Apply the update.

Note: If your ZenFone 4 does not display the update notification, go to Settings and check the software version is 6.3.3. Still you do not get the notification, reboot the phone and try.

5. Your phone will enter into recovery mode and install the update. Once the update is completed, your phone will reboot into Lollipop automatically.

Troubleshooting Instruction

For first boot, it will take 10-20 minutes. But if it takes more than that it means your device is stuck in a bootloop.
In that case, you need to factory reset you device. To do so, boot your phone into recovery mode, then factory reset it and then reboot it. (Source – Asus)