In the meantime my device decided to die permanently
Given Irex Technologies current state, I think I'm hosed. Luckily there are no new versions of the firmware, so there should be no changes needed :P
For anyone concerned about his reader: no, usage of trickd and death of my reader are *probably* not connected. It looks like flash memory storing kernel developed bad blocks, and it stopped booting. However, if you want to be 100% sure, don't use trickd.