The pocket-sized hacking tool is already pretty powerful out of the box, but installing third-party firmware can unlock a lot more power.
What is the best firmware for Flipper Zero? - Quora
How To: Xtreme Flipper Zero Firmware Flash. Unlocking Next-Level Performance: Upgrading Beyond OEM
Unleashing the power of the Flipper Zero - HaXeZ
Install Custom Firmware and Hack Phones
New Firmware Update System
Flipper Zero — Multitool for Hackers by Flipper Devices Inc. — Kickstarter
New Firmware Update System
First Look: Flipper Zero Launches an App Store for Hobby Hackers
Unleashing the power of the Flipper Zero - HaXeZ
qFlipper - Flipper Zero - Documentation