Speak of the Devil

Speak of the Devil is a quest in the Fallout 4 Creation Club content "X-02 Power Armor".

Walkthrough
After the quest starts, head to Wattz Consumer Electronics and pick up the holotape The Black Devil vol. 1, located on a table beneath a Black Devil poster on the store's entrance level. Connie's note can also be found underneath the holotape.

From there, head to relay tower 0MC-810, located northeast of the store, which will be guarded by hostile Enclave remnants. Locate the body of Richie near the relay tower terminal and take both the AM 810 music catalogue holotape and Richie's note, then read the note. Afterwards, use the terminal, extend the satellites and load the AM 810 holotape, then use the following options to transfer the files of "Stars and Stripes Forever" and "Battle Hymn of the Republic" (only one selection is needed.) The Radio AM 810 signal will become available afterwards.

Next, head to the BADTFL regional office. Find Connie's corpse in one of the interrogation rooms and pick up the FM 52.7 music catalogue holotape from the table, which will be locked and must either be hacked or unlocked with a password. Three options are then available:
 * 1) With Hacker 1+, a password list can be generated in the holotape to hack it like a standard terminal.
 * 2) With Hacker 3+, the holotape's encryption can be broken to immediately unlock it.
 * 3) Connie's confession, on the table, points to the password's location; it can be found in the hole in the wall behind Connie, in the form of the cigarette paper atop a pack of cigarettes.

When the holotape is unlocked, head to relay tower 0SC-527. Use the terminal and load the FM 52.7 holotape, then transfer the file of "America the Beautiful" to the relay tower. The Radio FM 52.7 signal will become available and will play America the Beautiful.

After the uploads are finished, travel to the Boston Police rationing site and enter Mass Pike Tunnel. In the room containing the remains of John Reise, a locked door and a nearby radio can be found. Activate the radio to unlock the door and complete the quest. The room contains the X-02 power armor and the Notes on the X-02, as well as the Black Devil's terminal and a safe which can only be unlocked with the terminal.