Tried this:
Re-installed 4.1 firmware (custom - 05.13.04 modem) - re-jailed with redsn0w-0.9.6b1- kernel does not match again
btw I think I can't install official firmware 4.1 because modem will be 05.14 as I know, and I won't be able to make calls (I have locked USA Iphone AT&T)