First try: Seas0nPass ran all steps and said it was done.
When I connected the ATV to the TV I got the same 5.2 that was installed with no file modified (About Apple TV said 5.2 not 5.3).
Second try: I tried restoring with iTunes (using the FW created by Seas0nPass) and got an error.
Third try: Again using Seas0nPass and this time I think the process went fine. It said Done. Now when I connect the ATV to the TV, the led blinks fast and no system is loaded.
I have fast blinking LED on the front of my aTV2. If appears as though it’s in DFU all the time (after serveral reboots etc). When I try “Restore firmware” and select the ATV2,1_5_3_…, SP goes throught the paces of a restore but in the end SP displays " Firmware restor failed?". I managed to recover the aTV2 via iTunes - but that gave me 6.0.2; as expected. The aTV2 had 5.3 on it.
Download atv 2 5.3 firmware and do a manual restore to 5.3. Try seas0npass again. I had success afters several attempts. Starting over on another computer.