This is Unofficial cyanogenmod CM12.1 Rom for HTC Explorer A310e by a recognized Developer of XDA and so you can’t consider it as stable as you HTC explorer Stock ROM so it may have some bugs like OMX ( hardware decoding/encoding ) and Camcorder else every thing is working.
AS CM12.1 is based on AOSP and to if you want this Cm12.1 Rom to be installed in HTC Explorer you device bootloader must be unlocked,Without Unlocking bootloader you can’t flash This CM12.1 Rom as it may Brick you device.
In this tutorial we are going to Flash unofficial CM12.1 in HTC Explorer with unlocked bootloader and having custom recovery in it like TWRP or CWM recovery.So let’s start The process of Install Cm12.1 Rom in HTC Explorer with Step by Step Tutorial.
#How to flash CM 12.1 Rom in HTC Explorer
3.Now you should use Use Class 6 or Class 10 sd-card for best performance.
Note:Copy Both the File in your SD card after making partition.
4.Now make Make 2 ext4 sd-ext partitions as give below.
2nd partition :- sd-system = 1.2 GB
5.Now download and Flash the TWRP 18.104.22.168 Recovery latest.
6.Then Convert your /data and /system partition to f2fs you can find it in wipe option in recovery.
7.Wipe all partitions from Recovery.
8.After clearing all partition Flash the cm-12.1-*-UNOFFICIAL-pico.zip you have just downloaded above.
9.After flashing completes Reboot your HTC Explorer.
Note:If you Stuck at HTC Splash Screen go into bootloader mode, take out boot.img from rom zip and flash it.
10.Done! you have successfully flashed CM12.1 Rom in your HTC PICO
11.After first reboot go back to recovery and Flash Gapps that you downloaded in the second step.
12.Done! If you face any problem you can report it to original developer from this source link given below.
Source : XDA developers