All Asus phone offical firmware link by Teddy

Asus Firmware collections

ASUS ZenFone 2
ZE500CL(Z00D) software Image: V12.16.5.118 for WW SKU only

=================

ASUS ZenFone 2
ZE550ML (Z008B/Z008C/Z008D) software Image: V2.20.40.149 for WW SKU only

===================

ASUS ZenFone 2
ZE551ML(Z00AD/Z00ADA/Z00ADB/Z00ADC) software Image: V2.20.40.185 for CUCC SKU only

==============================
ASUS ZenFone 2 Laser(Z00RD)
software Image: V13.10.10.25 for WW SKU only* Andriod M

============
ASUS ZenFone 2 Laser(Z00E/Z00ED/Z00EDA/Z00EDB)
software Image: V13.10.7.1 for WW SKU only* Andriod M

==================
ASUS ZenFone 2 Laser=ZE550KL (Z00L)
software Image: WW-21.40.1220.1708 for WW SKU only*Android M

===================
ASUS ZenFone 2=ZE500CL(Z00D)
software Image: V12.16.5.118 for WW SKU only

===================
ASUS ZenFone4(T00I)
software Image: V7.4.4 (Android L) for WW only

==================
ASUS ZenFone 4(A450CG)
software Image: V5.4.2 for WW SKU only

==================
ASUS ZenFone 5(T00F/T00J)
software Image: V2.22.40.540 (Kitkat) for WW SKU only*

=====================
ASUS ZenFone 5 (A500KL)
software Image: V11.4.6.107(Kitkat) for WW SKU only*

=======================
ASUS ZenFone 5(T00K)
software Image: V2.22.40.61 for WW SKU only*

============================
ASUS ZenFone 6(T00G)
software Image: V3.24.40.87(Android L) for WW SKU only*

===============================
ASUS ZenFone C=ZC451CG (Z007)
software Image: V4.11.40.179 for WW SKU

=============================
ASUS ZenFone Selfie
software Image: V51.15.40.1582 for WW SKU only*

==============================
ASUS Fonepad 8 (FE380CG)
Software Image Version: WW_ V5.5.0 For WW SKU only*

===============================
ASUS Fonepad 7 (FE170CG)
Firmware: V12.8.1.38 (for WW SKU version only)