Just a heads up for all jailbroken ATV2 users with Firecore aTV Flash (black). Note today's release of version 1.7 appears to have severe conflict issues with Plex (if installed). Scroll down on the Firecore user forum feedback page on this current release for further details:
http://blog.firecore.com/8555
Recommend holding off from updating to v1.7 until this issue is sorted out as it appears that if Plex is installed and the "Maintenance" link is updated, this will result in a perpetual rebooting loop of your ATV2, requiring you to SSH into your ATV2 and then having to perform a re-jailbreak...Yikes! Plex may or may not be functional afterwards. A real pain!

I hope PLEX will continue to support ATV2 (and future jail-broken ATV3), although it's recognized that resources and the associated development effort for this platform is limited as it remains an "unofficial" Plex client which sadly lacks an App Store.
I'm sticking with v.1.6 as everything works for now and off course I'm on this forum so obviously PLEX is important to me with a daily serving - breakfast, lunch and dinner.
Mac Client / Server (PMS Primary): Mac Mini (Late 2012) 2.6Ghz i7 Quad Core | HD 4000 | 16GB RAM | 256 SSD
iOS Clients: iPhone 5 64GB LTE | iPhone 4 16GB 3G | iPad 4 64GB LTE | iPad Mini 16GB | Apple TV2 | Apple TV 3 (Airplay only)
Windows Clients: 2 x Windows 7 PC's
DLNA Client: Playstation 3 Slim
NAS Server / Media Storage: Synology DS712+ and DX513 expansion unit | 18TB total | Dual 9TB RAID 5 (SHR) Volumes (Main /Backup) | Dual LAN with failover
Automation: SABnzbd + SickBeard + CouchPotato Server
Plex Remotes: Harmony 900 (RF) + Remote Buddy; iOS 6 Plex Remote app (iPhone & iPad)
Gigabit LAN via Cisco E4200 dual band router and Cisco SG100D-08 Gigabit Switch
Wired Broadband: 100+MBps D/L; 10MBps U/L via speedtest (wired ethernet to Mac mini & Synology NAS servers)