Unlock Bootloader-mode - Zenfone 5 a500kl

1 week and a half my phone does not start
Fix it by reinstalling the firmware
But three days ago I returned to spend the same
However no longer allows me to install anything



I just saw someone else has the same problem
and I do not think it's a coincidence that the dates are almost the same
-->>http://www.asus.com/zentalk/forum.php?mod=viewthread&tid=51149



I look for solutions and found that I turn it on boot-loader mode
but my phone  does not have this mode enabled
I get csc mode


I wonder how I can enable boot-loader mode
As the only solution to give me technical support of Asus
It is that I sent my phone to USA and live in peru

I hope you can solve
Thank you

HI, Guest##284574
please press power key +vol up key to into last pic..
you can reflash image in this mode.

Immortal Venerable_ASUS posted on 2015/11/6 11:40
HI, Guest##284574
please press power key +vol up key to into last pic..
you can reflash image in thi ...

I tried many time still same image "CSC mode"

The same problem described here:
http://www.asus.com/zentalk/foru ... hread&tid=60473

If hold power+vol up after 3th reboot a display comes to blue! instead of black.

how to solve ?? haing tis problem on my phone