Fire TV Stick 4K

Verdict

Partial, no root. On the Fire TV Stick 4K 1st gen (2018), model E9L29Y, FCC ID 2AIO6-6247, ADB + Projectivy Launcher works. Bootloader stays locked.

Tested firmware: Fire OS 6.2.9.8 (NS6298/4760), Fire TV Home 6450027.1.

Fire TV Stick HD 3rd gen (S3L46N) is not tested. Do not assume this path applies to that stick. That model stays an unpublished draft until it has two independent sources.

Why

Works around a Vizio that cannot be rooted: the TV boots to last input (HDMI), this stick provides a clean launcher (Vizio $69 TV).

How to

1. Skip Amazon sign-in during setup if the stick still allows it.
2. Enable ADB debugging and apps from unknown sources.
3. Sideload Projectivy Launcher from the official developer source via ADB. The Amazon Appstore wants a sign-in; do not download random APK mirrors. Verify the package signature against the developer.
4. Set Projectivy as the home screen. Fire OS may ignore the default-home setting and block accessibility home overrides — if it does, you need a small guard that brings Projectivy back. That guard is device-specific; we do not ship a binary.

Limits without root (first-hand on this firmware): after pressing Home, Amazon’s screen can flash for several seconds before Projectivy returns. After a reboot, Fire OS may show “We cannot detect your remote” until a button is pressed.

Related no-root debloat (not the path tested on this unit): dumbtv. Follow that repo; we do not mirror it.

What this is not

This is not a Kamakiri / bootloader unlock / Magisk root. Those paths are a different device class and a different brick risk. We do not host unlock payloads.