Firecore has just posted a few notes for those having trouble using Seas0nPass to jailbreak the Apple TV 2.

Here are the tips:

1. Some users have reported issues with ‘wifi sync’ enabled. Disabling this (if currently in use) seems to resolve a number of issues related to restoring in iTunes.

2. If you’re getting errors when creating the IPSW, please try the fix found here: http://forum.firecore.com/topic/3761#comment-13581

3. During the JB/restore process, once the Apple TV is put into DFU mode a special script takes over to automate the iTunes restore process. This process can be interrupted if you click away from the iTunes window before the actual restore has begun. Once the AppleTV restore (in iTunes) is underway it is ok to click away from the iTunes window. Update: This process will be improved in the next version of Seas0nPass.

4. When performing a tethered boot timing seems to be important. You will want to ensure the power cable is not connected until you get the rapid flashing light. Also, the HDMI cable needs to be connected promptly once the tethered boot process is complete, and before the white light on the AppleTV stops flashing.

5. The bug relating to the AppleTV forgetting wireless networks has been a known issue in all AppleTV jailbreaks to this point. Update: The wifi bug was partially fixed in 0.6.6. The AppleTV will automatically rejoin networks after a full restart, however the wireless network may still drop off when returning from an extended sleep. We’re currently looking into a more complete fix.

Note: If after all this you’re still having trouble please open a support ticket and send us the Seas0nPass log file found at: ~/Library/Logs/SP_Debug.log.

[source: Firecore]

You may also want to read
How to jailbreak Apple TV 2 on iOS 4.2.1 with Seas0nPass
How-To: Jailbreak Apple TV 2G on iOS 4.2.1 with PwnageTool
AirFlick Streams Non-iTunes Data to Apple TV 2 (video)

Visit What's on iPhone for the best iPad and iPhone app reviews!
Do you want to feel like a wizard? Check the Kymera wand in Amazon: You can control your Apple TV waving a wand!

Seas0nPass is a new jailbreak tool designed by FireCore specifically and exclusively for the AppleTV 2 (no other iOS devices support). This magic piece of software allows you to jailbreak your atv2 with the latest 4.1.1 (iOS 4.2.1) software by creating custom AppleTV IPSW files and restoring them in iTunes (similar to the existing Pwnage Tool app). It also includes a simple ‘tethered boot’ option which aids in using newer AppleTV firmwares when an ‘un-tethered’ jailbreak is not yet available.

Seas0nPass is available for free, and is open source (the source code is available on Github). It’s Mac only (OSX 10.6 or later) for now but the Windows version should be released soon.

Here are the instructions on how to use Seas0nPass to jailbreak the Apple TV 2:

NOTE: users are experiencing many kinds of problems with jailbreaking using Seas0nPass. Read the comments on FireCore’s blog before you decide to try the software on your own device.

Pre-launch checklist

1. Download and install the latest version of iTunes (check for updates through Software Update located in Apple menu).
2. Download Seas0nPass
3. A micro USB cable will be required to complete the jailbreak.

Jailbreaking

Step 1: Unzip the ‘Seas0nPass.zip’ file and launch Seas0nPass.

Step 2: If your AppleTV is not yet jailbroken, select ‘Create IPSW’. (if already jailbroken, and you just need to do a ‘tethered boot’ scroll down).

Step 3: The latest AppleTV software will be downloaded and used to create a custom ‘jailbroken’ software file.

Step 4: When prompted, connect your AppleTV using a micro-USB cable (leave power disconnected), and hold both the ‘MENU’ and ‘PLAY/PAUSE’ buttons for 7 seven seconds.

Step 5: iTunes will open automatically and start the restore process.

Step 6: iTunes will confirm the restore when complete – your AppleTV is now jailbroken. Please proceed to the ‘tethered boot’ section below.

Using Seas0nPass for a ‘tethered boot’

Some AppleTV software versions require a tethered boot. This means the AppleTV must be connected to a computer for a brief moment during startup.

Note: The AppleTV MUST be disconnected from the computer (for at least a brief moment) after restoring in iTunes for the tethered boot process below to work properly.

Step 1: Open Seas0nPass and select the ‘Boot Tethered’ option.

Step 2: When prompted, connect the AppleTV to your computer via USB. Wait for the rapid flashing light then connect the power. Once both are connected hold both the ‘MENU’ and ‘PLAY/PAUSE’ buttons for 7 seven seconds.

Step 3: Seas0n Pass will complete the tethered boot automatically. Once complete, remove the USB cable and connect the HDMI cable.

You may also want to read:
How-To: Jailbreak Apple TV 2G on iOS 4.2.1 with PwnageTool
AirPlay Streaming Hacked into the Old Apple TV (updated: giveaway!)
AirFlick Streams Non-iTunes Data to Apple TV 2 (video)
AirVideoEnabler Allows AirPlay Video Streaming from Any App

Visit What's on iPhone for the best iPad and iPhone app reviews!
Do you want to feel like a wizard? Check the Kymera wand in Amazon: You can control your Apple TV waving a wand!