Nifty Future 5min Ambush Style-Live

no problem...the more ppl post its good for everyone....
look at the rsi level at 12:15 hours.. it had almost approached 0.. can one take long positions at this rsi level even though the trend was downward??

1 more thing i have noticed in many charts. rsi level is not reliable when it is between 20 to 80 (positive divergence but market heading south and vice versa).. but above 80 and below 20 it is reliable.. it is most realiable above 90 and below 10.
is my understanding right?? or m i missing something??

P.S. plz dont mind my questions.. m a novice.. u can reply 2 them whenever u wish to..