The HTC One M9 Developer Edition handsets are now receiving the Android 5.1 Lollipop through OTA (over-the-air). The changelog released by the Taiwanese tech company suggests that the new firmware upgrade improves the performance of calling, battery and data.

The HTC One M9 Developer Edition is an unlocked device that comes with open bootloader which enables owners to install custom ROMs and develop apps. According to Android Police, the size of the firmware update for the HTC One M9 Developer Edition is 800 MB and the update brings the software version 2.6.651.11.

The HTC One M9 is powered by Snapdragon 810 chipset that is infamously known for its thermal heating problems. The new firmware also optimizes the temperature management for handling the Snapdragon 810 chipset in a better manner. And it also brings along camera-performance enhancements.

The source claims that the handset may get warm while installing the firmware update. HTC is aware of it and advises users to not get alarmed. The HTC One M9 Developer Edition Android 5.1 OTA update is being made available to all users across the globe. Hence, all the users are likely to receive the update at the same time.

In order to install the update, users are required for Android 5.1 OTA update notification to arrive or users may navigate to Settings to initiate the software update manually. The specs of the HTC One M9 Developer Edition are the same as that of the HTC One M9 flagship.

The device has a thickness of 9.6 mm and weighs 157 grams. It is available with a display of 5 inches. along with support for full HD resolution of 1920 x 1080 pixels. 

The Snapdragon 810 chip is supported by 3 GB of RAM. The internal storage available on the device is 32 GB, and users can add up to 128 GB of microSD card storage on the expansion slot.

The rear of the HTC One M9 Developer Edition is flanked with 20 MP camera, and in the front, there is a 4 MP camera. It features a Cat. 6 LTE modem and houses a 2,840 mAh battery.