Help w/ ROM3

[coppermouse]

I am pretty new to Dish plastic programming, I understand I need to put a blocker on.
I have an unmarked ROM 3, what is the best (free) one to use?

[robo]

checksum blocker

[JT]

Also referred to as GCSB or Generate CheckSum Blocker

[coppermouse]

Thanks I will look for it