So although there are ways to hack a Biomonitor via PAN, essentially if you put the correct counters (such as using a Hacker friend, Encryption, Black IC, etc.) hacking it becomes incredibly hard. Unless you face Professional Rating 5 or 6 Hackers regularly. Who hack you vs. the rest of the team. Because the GM knows you are the Sammie with Pain Editor. Because Pain Editor is BA with a Biomonitor.
Although, RHat is right that you can't just completely disable it due to update issues. Tie it to PAN and be smart with defenses. If you are always the guy targeted by a Hacker either A) you need to tone down the I AM THE SAMMIE aspect of your character or B) the GM is screwing you.
I say this BTW even though like 90% of the time I am the GM. Variables exist such as an unscrupulous Street Doc that sells the info on your Pain Editir to the enemy, forcing the enemy to specifically target the Sammie.