juanmol:
i'll try, but ... why i don't need it yesterday?
You did not need it yesterday because programming was working.
You have the t85 programmed to output on one of the programming pins. If the programmer (your Uno) is not asserting RESET on the target, the target will continue outputting while the programmer tries to program. This can result in a short-circuit between the the processors and may damage either or both processors.
I suspect from your posts that you did not read (or did not understand) Reply #1 so I will restate the most important part...
The purpose of the resistor is to protect your Uno (and the t85) until you resolve the problem.
The resistor(s) serve no other purpose. They will not help you resolve the problem.