jcnormandin:
the mini is on communication with another serial device or waiting for it, how I can download the program for an update.
It's not recommended to connect multiple devices to the serial pins, since it makes it difficult to prevent one or the other from communicating.
However, pushing the RESET button is not necessary. When avrdude begins uploading the code, it RESETs the ATmega chip automatically. Again, the challenge will be keeping the "other device" from trying to communicate when the code upload is happening.