Yes. Here is a rooted custom firmware based on latest ARCHOS 80 Cobalt update published by ARCHOS (20130329)
Build information
Linux Kernel: Linux version 3.0.8+ (lfzhou@midcs-desktop) (gcc version 4.4.0 (GCC) ) #9 SMP PREEMPT Sat Feb 2 10:10:33 CST 2013
Android build: A825KD-user 4.0.4 IMM76D 20130202.162053 release-keys
Custom firmware features:
- root with latest SuperSU 1.25 (free version)
- Google Play Store fixes so more application are visible/compatible