While for some Android 5.1.1 Lollipop update still is elusive to their phones, the first generation Motorola Moto E is lucky enough that a Lollipop-based custom ROM is made available through developer community CyanogenMod. With it of course is the much-awaited solution to the notorious Stagefright vulnerability.

CyanogenMod 12.1 firmware has been updated by the custom ROM developer community for the Motorola Moto E (1st Gen) bringing a patch for Stagefright security threat which was first found out months ago. Stagefright attacks via MMS sent to messaging apps usually Google Hangout and Whatsapp. When the device's user opens the MMS the threat will start to destroy or steal data from the device without the user knowing it.

Before heading over to the installation process, remember a few things: by proceeding to the installation, user is free from any warranty from Motorola. Also, charge up battery up at least 80 percent.

Since Android 5.1.1 Lollipop update for Motorola Moto E (1st Gen) has not been announced or even hinted by the Lenovo-own tech firm, here's a good way to go manual installation of a custom ROM based on Android Lollipop.

1.     Download CyanogenMod Android 5.1.1 Lollipop CM12.1 custom ROM here and Google Apps here into PC. Download Cyanogen Recovery as well here.

2.     Plug in Motorola Moto E (1st Gen) to PC using a USB cable. Ensure that the USB driver software is installed to PC before plugging.

3.     Move all downloaded files to device's SD card's root folder memory.

4.     Ensure the device is rooted and has installed ClockworkMod Recovery/TWRP tool before proceeding to installation.

5.     Turn off device and disconnect from PC.

6.     Press hold volume - and power button simultaneously to enter Recovery mode.

7.     Wipe data or factory reset device.

8.     Clear cache memory via 'wipe cache partition.'

9.     Go back to Recovery mode.

10.   Choose 'Advanced.'

11.   Click 'wipe dalvik cache.'

12.   Go back to Recovery mode again.

13.   Click 'install zip from SD card.'

14.   Click 'choose zip from SD card.'

15.   Go to Android ROM .zip file in SD card and install.

16.   Go to Google Apps .zip file in SD card and install.

17.   When finished installing, go to '+++++Go Back+++++.'

18.   Reboot device.

In a few minutes, the booting process shall be completed. Then head over to Settings > About phone verify the new firmware of the device which should now be Android 5.1.1 Lollipop CM12.