Cyberpunk 2077: How to Unlock the Dev Room

Ever wanted to unlock the locked room in Little China near the Netrunner shop where you get the hack for free from the vendor?

Unlock the Dev Room

How does one access the dev room?
A few steps.
If you go the netrunner shop to pick up the hack that T-Bug says that you should have, you will be in the right area. Go downstairs to where the gun shop is
and turn right and keep going until you see a garage door on the end.

At this point, you will have a keypad next to the door. The code is 605185.
After entering this code, you will have unlocked the door.

p.s. Doing this later on in the story is advisable.