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The Cookie menu has two items. Both require root — without it, you’re shown an error telling you to grant root and retry.
1

Pick a package

Choose a single detected Roblox package, or All Packages (cookies.txt) for bulk import.
2

Provide the cookie(s)

Paste the .ROBLOSECURITY cookie directly. It’s validated for format before use.
3

Verify and inject

Each cookie is verified against Roblox before being injected — invalid cookies are rejected with an error instead of being applied.
4

Relaunch

All targeted packages are killed, windows are re-arranged (if Auto Arrange Windows is on), then each package is relaunched already logged in (staggered by 2s in bulk mode).
Cookie Login requires at least one detected Roblox package. If none are found, install/open Roblox first.
Extracts the .ROBLOSECURITY cookie from every detected package (verifying each to also capture the username) and writes them all to:
One line per account, formatted username:cookie.
This file is also read as a fallback by Phantom API rejoin — if extracting a cookie directly from a package’s database fails, Phantom API falls back to whatever’s saved here.