ipod touch 4th gen doesn't turn on

ipod touch 4th gen doesn't turn on

My ipod touch 4th gen has this CYDIA, I accidentally uninstalled one file
from it. After that, the ipod crashed and never turned on since then.
It turns on (showing apple logo) for 10 seconds, then turns off. After 2
seconds, it turns on again. Whole process repeats. Until battery's
exhausted.
I tried this:
Hold the power button for 2 sec. Without letting go of the power button,
press and hold the home button for 10 sec. Let go of the power button but
not the home button for another 10 sec.
It connects the ipod to itunes, itunes detects the ipod. However, it has
an error message " the ipod software update server could not be
contacted".