anyone else noticed (maybe all do this) - when you reboot it goes back to factory defaults ?

I used the "shutdown now -h" command at the cmd line in ssh and it shut down gracefully - but after moving it and powering back up - I had to reenter my network and miner configuration settings (also cant change web gui password)

other than that its working great

I just tried using the web interface to reboot (after re-entering net and miner config) and same thing - factory defaults on boot - (and the time before rebooted then shutdown with cli)

its the stock config - so I havent replaced the micro sd card

the S2 is working fine - so its just mildly annoying - but if the power goes out etc - it will be offline until I reenter the config
(even the miner config settings are not saved)

Its a new batch-4 S2 - so I wonder if thats the way they are shipping now to prevent sd corruption (or something)

Interesting, mine uses the commands that Tracer posted (shutdown -h now) very well so far. In my case, when I tried to "reboot" from the gui it got stuck somehow with both green and red light "on" on the front panel. Upon swithing power off and on again, it revitalized itself. I am surprised how each machine/software combo is so individual-I had the same with S1. Each one has it's own little peculiarity.

Agreed.  In your position I would try this.

got it - thanks

any limit on size of SD Card? (I imagine 4/8GB is more than enough)

A question from a newb in sd cards and flashing..Do you just copy the image file to a micro SD card and stick it in or there is a need to use terminal, etc.
Thanks.

ok, thanks-bootable was a key word 

My new S2 is generating only 800 GH/s. Are two "chains" dead? Should I open the box and check if the boards are properly connected?

I went ahead and opened the device. Two cards were completely loose and couple were not seated all the way. I made sure all the cards were seated properly. The work on heatsinks was quite rough and the heat sinks have sharp edges. I cut my finger and couple of drops of blood dropped on one of the boards. I wiped the blood off with a tissue and reassembled the device. The sacrifice of virgin blood seemed to work and now all 10 boards are hashing, and I am getting 1 TH/s.