How to Hack Security Droids
On Kashyyk (third planet), after the Security Droid boss, you will free the Wookies from their prison. On the exterior walkway outside the prison block, look to the right to see a locked door and hanging rope. Jump to the rope and swing to the second rope, leading to a raised alcove and upgrade station. Use it to upgrade BD-1 with a hacking module, allowing you to take over damaged Security Droids. After doing enough damage to Security Droids, a prompt will appear allowing you to take control of them. This upgrade is easy to miss during your first visit to Kashyyk. It is not required, but it does make future encounters against large numbers of enemies much easier. Security Droids are common on Imperial Bases, and you will sometimes have to deal with waves of enemies from landing craft. Security Droids are also an easy way to distract enemies.