Many AOSP and stock based custom ROMs released for the Galaxy S4 I9500\/I9505 recently such as EuphoriaOS, CM12.1 Unofficial ROM and Resurrection Remix ROM etc. Now we've some good news for the Galaxy S4 I9505 owners that Imperium ROM is now available to download for these devices. Imperium ROM is based on the latest Samsung's official Lollipop firmware (Android 5.1 Lollipop) which is a pre-rooted, deodex and zip-aligned. Many users have tested this custom ROM and found is much stable and faster. If you want to install this firmware then follow the given instructions on how to update Galaxy S4 LTE I9505 to Android 5.1 Imperium Lollipop custom ROM. Keep in mind that this is a custom ROM, not officially released by Samsung. Thus you'll need a custom recovery like TWRP or CWM in order to install this Imperium custom ROM on your Galaxy S4 LTE I9505. Now if you are ready then go ahead and get this awesome ROM on your S4. Here we've given a quick list of the main features of this ROM: Imperium Custom ROM (Android 5.1) Features: \tBased on the official brasilian FW I9505JVUHOC1 \tDeodexed \tZipaligned \tRooted with SuperSU \tBusybox \tAroma installer Note: This guide containing the Android 5.1 Imperium ROM and instructions can be used only for the Galaxy S4 LTE model number I9505 only. Check the model number of your device, if it is I9505 then go ahead, otherwise not. Please do not try to flash this custom firmware on any other device or incorrect variant. Warning: AndroidBlog.gs will not be held responsible for any kind of damage occurred to your Galaxy S4 I9505 during or after the installation of Imperium custom ROM. Proceed at your own risk. Pre-Requirements: \tCreate a proper backup of all your important data and settings using a recommended custom recovery like TWRP or CWM. \tDownload and install Galaxy S4 LTE I9505 USB Drivers on the PC. \tEnable USB Debugging on the Galaxy S4 on the PC by navigating to Settings > Developer Options > check USB Debugging option. \tThe Galaxy S4 should be rooted with the latest version of custom recovery installed. \tThe bootloader of your phone should be unlocked. \tCheck the battery level of the S4, it should be charged at least about 80% to prevent unexpected shutdowns while installing the Imperium custom ROM. Required Files: \tDownload Android 5.1 Imperium custom ROM for Galaxy S4 LTE I9505 Steps to Install Android 5.1 Lollipop on Galaxy S4 LTE I9505 with Imperium ROM: Follow these instructions to update Galaxy S4 LTE I9505 to Android 5.1 Imperium Lollipop custom firmware. 1:- First, download\u00a0Android 5.1 Imperium Lollipop custom Firmware (Imperium_LL_Rom_OC1_v3.1.zip)\u00a0for Galaxy S4 LTE I9505 on the desktop of the PC. 2:- Plug your device to the PC using its USB data cable and mount its USB memory storage. 3:- Transfer\u00a0Android 5.1 Imperium ROM .zip file which you\u2019ve already downloaded from the above link, to the root folder of your SD card on the phone. 4:- Unplug the\u00a0Galaxy S4 I9505 from the PC and power it OFF in order to boot into Recovery Mode. 5:- Power ON the device while pressing and holding\u00a0Volume Up + Home + Power buttons at the same time to enter into Recovery Mode. 6:- While your device is now in CWM Recovery, perform wipe data\/factory reset, wipe cache partition and wipe dalvik cache also by navigating to Advanced > Wipe Dalvik Cache. Note:- wipe dalvik cache will help you to prevent boot loops and other errors while ROM installation. 7:- Go back to the main Recovery Menu and choose install zip from SD card \u2192 choose zip from sdcard. 8:- Navigate to the\u00a0Android 5.1 Imperium Lollipop custom ROM .zip file which you\u2019ve already transferred to the SD card of your device\u00a0previously. Select the ROM .zip file using the Power button and confirm the installation to begin. 9:- Go to +++++Go Back+++++ once the installation is completed. From Recovery Menu, reboot your device by selecting reboot system now. Your\u00a0Galaxy S4 I9505 will be rebooted and may take about 4 to 5 minutes to boot for the first time after installation. Done! You\u2019ve successfully updated\u00a0Galaxy S4 I9505 to the latest Android 5.1 Lollipop with Imperium custom ROM. Let us know in the comments area below if you have any query or trouble while installing this Imperium custom firmware featuring Android 5.1 Lollipop on your Galaxy S4.