hard brick? [asus zenfone 5 - lollipop]

I have a problem with my asus zenfone 5 (root). I think it's hard bricked. I will explain better, yesterday I did a restore to "clean" the system, while restoring freezes, then I try to boot into recovery mode. I long ago, installed a custom recovery, the fact is that by inserting the recovery.img and trying to start it from the custom recovery. I get errors and does not install, so start in droidboot mode to adjust all manualmente by pc (GNU / linux), with fastboot flash recovery.img, but when I have to do the last step described by driving mistake.
Now I do not have a chance to get more in recovery mode, in fact, when I press power + vol appears the Android logo with red exclamation point, if I try to start it normally there is a loading of the asus logo with the infinite wheel, but when there is asus adb logo detects it, it just says chen is not "authorized", the phone has to be thrown away? There are hardware / software solutions ?
thank you so much