Thank you for the answer.
So, if i choose manually the 25--->50 option there will be no micro-stuttering ?especially in moving objects or people?
Also, can i choose it while i play the video or must i go back to the menu?
Case of 25fps interlaced video switch it to 50, in case of 29.97fps switch it to 60. I rather call it a constant stutter, not micro, as it would be constant all video long, due the half fps, the player would drop each second frame. Bearable, but with manually switched you will get much smoother motion effect.
The most correct freq for 29.97fps interlaced videos would be 59.94Hz, but that's not an option here. So 60Hz is the closest you can get. Not sure tho if you will detect any micro stutters in this case due the not exact matching cadence. In theory you may, but maybe the player or the TV does it's job to compensate the effect.
The best and safest way is to switch it in the Settings menu every time before the actual playback happens. For everything else, leave it on 60Hz and set 24p mode back on.
Edit: Oh, and in this case don't forget to set 24p mode to OFF before you play the interlaced videos.