I use only community firmware, not really much into T-Deck personally. There's a lot of alternative open source firmware as well though.
There's also
by @Grafton
GitHub
GitHub - satsdisco/meshngr: Beautiful mesh messaging for MeshCore LoRa radios. Off-grid. Encrypted. No internet required.
Beautiful mesh messaging for MeshCore LoRa radios. Off-grid. Encrypted. No internet required. - satsdisco/meshngr