The answer is yes.
But you have to know that:
(a) the device is actually reprogrammable (i.e. data is not stored in ROM)
(b) that you know the coding in use (i.e. the language) and that it is accessible i.e. unencrypted
(c) you know WHAT parameters need changing
(d) you know WHERE to access those parameters
(e) you know HOW to upload the data
(d) you have the equipment to do it (assuming (a-e) are applicable)
..... off you go!