Dear Customer,
Thanks for your patience, here is the L update for ZF5/ZF6:
How to update to Android L for ZF5 WW (A500CG/A501CG)
1.Make sure you have updated to KK v2.22.40.53 or v2.22.40.54 (bridge build), download it from here if you haven’t yet : (Put it on the Internal Stroage of your phone , no need to unzip the zip file, then unplug USB wired. Drag down notification => shows "system update")
http://dlcdnet.asus.com/pub/ASUS/ZenFone/A500CG/UL-ASUS_T00F-WW-2.22.40.53-user.zip (ZF5)
http://dlcdnet.asus.com/pub/ASUS/ZenFone/A600CG/UL-ASUS_T00G-WW-2.22.40.44-user.zip (ZF6)
2.Download Android L image v3.23.40.60 from this URL: (Put it on the Internal Stroage of your phone , no need to unzip the zip file, then unplug USB wired. Drag down notification => shows "system update")
http://dlcdnet.asus.com/pub/ASUS/ZenFone/A500CG/UL-ASUS_T00F-WW-3.23.40.60-user.zip (ZF5)
http://dlcdnet.asus.com/pub/ASUS/ZenFone/A600CG/UL-ASUS_T00G-WW-3.23.40.60-user.zip (ZF6)
If you want to know more details about steps, please follow Manual Update from FAQ: How to update firmware on my phone?
(http://www.asus.com/uk/support/FAQ/1009748/)
Please note that :
-Update asus backup app to the lastest version from google play. Then Backup your personal files like photos, videos, contacts, SMS…before update
-Once updated to L, no way to downgrade back KK
-No longer support NTFS format SD card. Please remember to backup your SD card data before upgrade to Android L with following steps:
1. Connect your ZenFone and computer with USB cable
2. Enter your ZenFone storage via computer
3. Select all data and copy it. Paste all your SD card data to your computer
-More details about release note, please refer to our Zentalk:
http://www.asus.com/zentalk/forum.php?mod=forumdisplay&fid=39
Thank you!