Apple TV don't boot up, after update

i just clicked on "update" on my Apple TV (2nd generation). Aftet step 1 and step 2, Apple TV won't boot up and Apple TV's white light is blinking, for 24 hours now and on TV showing the apple logo. From time to time, tries to reboot, but does not work.
Any help, please..?

Dear Winston, just today, a bought the cable and I did step by step, as you wrote.
AppleTV (2), stop flashing, after the connection to the TV set, but TV says "no signal".
I unplug it once from electricity and plug it again, but the white light, started flashing again.
Then I follow once more your instraction, and I "restore" it again. No respond. "No Signal" message on TV.
Any help, pls..?
PS. From wireless control, I try to reset it (by pressing the 2 small blacks) I have the "apple" on screen, but the white light starts again flashing, with no extra respond.

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