How to Install CM12.1 Android 5.1 Lollipop Firmware on HTC Desire 816 XDA developers have announced that they have discovered the latest CM12.1 firmware for the HTC Desire 816. Hence users can update to this version without waiting much for the OTA release. Here are the steps to update it manually. Follow it carefully without making any error. Update HTC Desire 816 with Android 5.1 Lollipop Firmware However, the CM12.1 firmware is on its initial phase and this is the only alpha version of Lollipop firmware. Hence the following procedure can be used only for the advanced users. And the latest Android OS incorporated with CM12.1 firmware has certain bugs and software issues. This can be resolved though. Pre-requisites: The following guidelines are made for the HTC Desire 816 only. Make sure that your device has at least 80% battery backup while doing this process. Enable a proper custom recovery tool like CWM or TWRP on your device. Install required USB drivers on your PC and USB Debugging Mode on your Smartphone. Steps to Update HTC Desire 816 with CM12.1 Android 5.1 Lollipop Custom ROM Firmware: Step 1: Download the CM12.1 and Gapps files on your PC. Step 2: See that Gapps files will be kept separately as they aren’t included in the latest Android update. Step 3: Keep the above downloaded files on your PC without unzipping. Step 4: With the help of a USB cord, connect your PC with HTC Desire 816 and move the above downloaded files to its internal storage. Step 5: Remove the USB cord. Switch off your device and go to the recovery mode. Step 6: Click on “wipe the system” and “clear cache” from the options coming over there in the recovery mode; it is included in “wipe data factory reset”, “wipe cache partition” and “wipe dalvik cache” Step 7: Select “install zip from SD card” and “choose zip from SD card” from the recovery mode menu appears on the screen. Step 8: Choose CM12.1 firmware file from it and then you can directly flash your HTC Desire 816 with Android 5.1 Lollipop version. Step 9: Finally, you need to repeat the update operation for flashing Google Apps package. Repeat the above steps for Gapps files as well. Step 10: Once you’re done with it, then you can reboot your device now. Now, you can begin using your HTC Desire 816 installed with CM 12.1 firmware.