WARNING! WARNING! Please don't experiment with stuff which you can find in this thread until you know how to handle the unexpected situations. Explanation: I just found that N900 TWL4030 may keep settings while N900 is switched OFF. It is pretty obvious (if I think i little) - this chip is powered by battery. I was not able to reboot a kernel which booted yesterday - until I removed battery for 30secs. Moreover, after that N900 software asked me about date, time, zone something else after that (but it is stll gave me a right advice of these values).