Install SlimLP Android 5.0.2 Alpha 1 ROM for AT&T LG G2 D800

The official SlimLP 5.0.2 Alpha 1 ROM from SlimROMs team is now live for download and installation for the AT&T version of the LG G2 phone. Use this post in order to learn how to successfully install this new custom ROM for your device.
This is a custom ROM that is based on the latest build of Android 5.0.2 Lollipop AOSP, but it also packs its own features designed by the SlimROMs team. Besides the stock Lollipop features you will find elements borrowed from CyanogenMod and Paranoid Android custom ROMs. If you want to learn more about this release, then you should read the post here.
Before starting the installation process of this new ROM you will need to read the preparation guide below:

• use this post only with the AT&T variant of the LG G2.
  – check the model number of your phone under Settings> About Phone and make sure that the “d800″ value is listed there.
  – do not update any other version of LG G2 with the files that you will find in this post.
• your phone has to be rooted and running the latest CWM or TWRP custom Recovery image.
  – the installed custom Recovery has to be upgraded to its latest build, so that it supports the Android 5.x Lollipop ROMs.
• the ‘how-to’ part of this post features two extra steps: the NANDROID Backup and the Factory Reset.
  – do not skip these steps.
  – NANDROID Backup: use this step in order to create a complete restore point for your device, one that you can use in case the new ROM doesn’t boot in normal mode.
  – the Factory Reset: this step wipes clean the system partition, it removes all data that was installed by the previous ROM.
  – the ‘factory reset’ process doesn’t remove any data from the phone’s internal sdcard.
• if you wish to save data from installed apps, then you can use Helium for Android.
  – sync Contacts info with your default Gmail account.
• read the whole guide and don’t skip any steps.
  – make sure that the phone’s battery charge is over 50%, it prevents the device from powering down during installation.
• this is a guide for advanced Android users, we cannot be blamed in case you end up losing any data in the process.

Now that you know all of the above you can continue to the next part of this post.
NOTE: this Alpha 1 build is a test release and it might pack some errors and bugs, install it only for testing purposes.
The stable SlimLP builds based on Lollipop AOSP will be available for download some time in the future.

How to flash SlimLP Android 5.0.2 Alpha 1 ROM for AT&T LG G2 D800:

1. Download the ROM zip file from here.
2. Download Gapps for SlimLP ROMs here.
3. Move the downloaded zip files to your phone’s internal storage.
   – don’t unzip these files.
   – after the transfer is complete you can disconnect the device from PC.
4. Power off the LG G2 and then boot it in Custom Recovery Mode.
5. Set a NANDROID Backup for the ROM that’s already installed on your phone:
   – CWM: select ‘backup and restore’.
   – TWRP: press ‘backup’.
   – set an easy to remember name for this file and confirm process.
6. Now you can ‘factory reset’ the device:
   – CWM: select ‘wipe data/ factory reset’.
   – TWRP: press ‘wipe’.
   – confirm.
7. Start the ROM flashing process:
   – CWM: select ‘install zip from sdcard’, then ‘choose zip from sdcard’.
   – TWRP: press ‘install’.
8. Find the new SlimLP ROM zip file and confirm its installation.
9. When the ROM has been installed you can flash the new Gapps zip, too. Use the same actions as in step 7 in order to find and install Gapps file.

NOTE: the first boot process of this new ROM should take more than ten minutes before it loads all the new files, which is why you should wait until the welcome screen appears without pressing any buttons.
If the phone fails to boot, then you will need to repeat the whole guide more than once. Use the comments field below in case you need any extra help.
need ROM for versions here