Hi all, PLEX rocks, watched a few movies last night, 720p no problems at all.
Firstly, on getting your AppleTV2 into DFU mode I was also having a nightmare of a time. I was getting all kinds of weird errors when trying to put the built IPSW into the device. Here are my steps.
1. Power and USB connected, restore apple TV with iTunes, no JB just a fresh restore so you will get a fresh ipsw from apple, that will save in the correct location etc. Yes I know you can download from xyz, but thats what seemed to be causing my issues of not being able to restore correctly.
2. Once restored, pull USB, insert HDMI. Setup language on tv.
3. Pull HDMI, insert USB (leave power in)
4. Remove any ipsw you may have got for your ATV except the fresh one in your user/itunes/../ that apple used to restore in step 1.
5. Run Pwnage tool, once it has built etc, it will tell you to UNPLUG POWER! do so and follow instruction.
6. Once Pwnage tells you (yes it told me it was in DFU mode the first time too but it wasnt) option click restore, and choose ipsw on desktop.
Plex honestly is a huge step, is it perfect, no, but it really is usable, its very fast.
Bonus finding.... I have a few Macs and a hackingtosh too. anyone using a hackingtosh make sure Bonjour is working or Plex will not see any files and crash like no tomorrow.
Hope this helps some people.