Get Squatch Mesh
Free and open source. Pick your device: the web installer does everything from Chrome or Edge over USB, or take the files and flash them your own way.
LilyGo T-Lora Pager
The full firmware: messages, maps, themes and field tools, on the pager's keyboard and wheel. Latest release: v1.2.x.
Install in your browser Files on GitHub
Already running it? New versions come over Wi-Fi: Settings › System › check for updates. Turn on beta updates there to get new builds before they're released.
LilyGo T-Deck and T-Deck Plus
Made for the touchscreen: your newest chats on the home screen, swipe up to unlock, tap to answer. It runs on real T-Decks and is still new. Version 1.2.2-beta3.
Install in your browser Download the .bin
On Wi-Fi it updates itself. The .bin is one image, written at address 0x0 with esptool or Espressif's web flasher: how.
Which one do I have? The pager is the wide one with a scroll wheel on its side. The T-Deck is shaped like a small BlackBerry, with a trackball above the keyboard. Coming from other firmware? Each install page says how to keep your keys and contacts first.