Samsung Galaxy S5
New Samsung Galaxy S5 smartphones are seen on a display at the Mobile World Congress in BarcelonaReuters / Albert Gea

A new Android 5.1 Lollipop CM12.1 custom ROM has been made available to the Samsung's 2014 flagship smartphone, Galaxy S5.

This new custom ROM is based on the AOSP (Android Open Source Project) CyanogenMod and this is an alpha CM12.1 version, so some issues are yet to be fixed. We advise our readers go through the whole tutorial article before going ahead with the installation.

Features of CyanogenMod Android 5.1 Lollipop CM12.1 Alpha custom ROM which are said to be functional on Galaxy S5:

  • Wi-Fi
  • Data
  • Bt buggy
  • GPS
  • Cellular service
  • Camera
  • MMS
  • Mods

XDA software developer, vinman12 has claimed that the newly released OS version (build date: 26/03/2015) has fixed some bugs encountered in earlier versions like MMS, Alarm Clock and the package installer will come with an option to turn off su # in statusbar. As of now, no other issues are found in the custom ROM, but if facing any glitch, please report the bugs, HERE.

Prerequisites (things to remember before installing Custom ROM)

  • Though installing custom ROM improves the device's performance and UI experiences, it makes the company warranty void and they will no longer be liable to provide updates in future [users can restore warranty by flashing the device with stock-ROM].
  • Make sure the device is rooted before going forward for custom ROM installation.
  • This new CyanogenMod M12.1 series Android 5.1 Lollipop firmware from Team Nocturnal has to be installed on the Samsung Galaxy S5 -klte & klteusc- models only; if tried on other devices, it might get bricked [To check your device model: Go to Settings >> About phone >> model number]
  • Installation of custom ROM requires clearing of memory in the smartphone, so make sure to back all the data by installing Clockwork Mod (CWM) Recovery/ TWRP in the smartphone.
  • Users make sure they have installed USB drivers on the PC, or else your phone (Samsung Galaxy S5) smartphone will not be recognised by the computer.
  • Make sure your device has more than 80% battery, or else there is chance of smartphone getting temporarily bricked if the installation process is interrupted in the mid-way.

[Disclaimer:This procedure is very technical and should be performed by a person with sound knowledge of rooting (or manual software installation) Android devices. If the step-by-step installation process is not followed properly, there are chances of the smartphone getting bricked or being permanently irreparable. International Business Times, India Edition cannot be held responsible for any damage or claims from readers if the procedure does not yield the required results or if the smartphone is bricked. Hence, users are advised to proceed with caution.]

Step-by-step installation procedure of Team Nocturnal Android 5.1 Lollipop CM12.1 Alpha Custom ROM on Samsung Galaxy S5 (klte & klteusc) models:

Step 1: Download CyanogenMod Android 5.0 Lollipop CM12.1 Alpha series Custom ROM (HERE) and Google Apps (HERE) in to your PC.

Step 2: Connect Samsung Galaxy S5 to PC via USB cord.

[Note: Before plugging the phone to the computer, be sure that you have installed USB driver software, if not, click HERE to download the firmware]

Step 3: Then, place Android v5.1 Lollipop CM12.1 custom ROM zip file into the phone's SD card memory. [Note: Users are advised to paste the .zip file in SD card root, not in any other folder.]

[Note: Before users' begin installing the custom software, be sure that the device must have rooted and has installed ClockworkMod Recovery/TWRP tool.]

Step 4: Now, turn off the device and disconnect from the PC.

Step 5: Then perform the regular Recovery Mode sortie by press holding 'Volume (up)', 'Home' and 'Power' buttons.

Step 6: After entering the RECOVERY mode, clear the phone memory, by selecting 'wipe data/factory reset'

[Note: use 'Volume' keys to navigate and 'Power' button to select options, while operating under Recovery Mode]

Step 7: Now, clear the cache memory by choosing 'wipe cache partition'

Step 8: Then to go back to ClockworkMod recovery, and select 'advanced' and tap 'wipe dalvik cache' [Note: This step is optional, but many recommend this procedure so that user will not face boot loops or any other errors in the middle of custom ROM installation]

Step 9: Again come back to main recovery screen and then tap 'install zip from SD card'

Step 10: Then tap 'choose zip from sdcard' and go to Android 5.1 ROM .zip file in SD card and enter the installation process. Once again reboot to Recovery mode and then flash Google Apps .zip file [Note: use 'Volume' keys to navigate and 'Power' button to select options]

Step 11: Once done with the installation process, navigate to '+++++Go Back+++++' and re-start the device by opting 'reboot system now' seen in the recovery menu.

Now, your device (Samsung Galaxy S5) will take a few minutes to complete the booting process.

Users then head to Settings >> select About phone to confirm the installation of CyanogenMod Android 5.1 Lollipop CM12.1 Alpha custom ROM.

[Credits: XDA Developers forum member- vinman12, Team Nocturnal, xda
cm source, albinoman887 & TeamHydra source]