Ok, one more thing. It seems my device ignores the key combo, but I was still able to get into fastboot mode by using adb. However, I have tried to flash a custom recovery with no success.
I tred using the supplied installer and after rebooting I get to the open robot screen with the red exclamation mark. Then, after holding some keys (not sure if power or power + volume down I get into recovery, but it's still the stock android recovery. Then I tried flashing the recovery image from fastboot mode. It sait the recovery was flashed, but still cannot boot into recovery. What's wrong with my phone?
Samsung i600 -> T-mobile G1 black -> SGS i9000 -> SGS3 LTE I9305 -> Iphone 5 White-> LG G2 D802 White