🔧 Meshtastic Firmware v2.7.21.1370b23 — Meshtastic Firmware 2.7.21.1370b23 Alpha

Meshtastic firmware v2.7.21.1370b23 was published on April 6, 2026. This is an Alpha pre-release, not a stable build, but it looks notable enough to flag because Meshtastic has not shipped a non-prerelease build since November 2025.

GitHub release: v2.7.21.1370b23
Release type: Pre-release / Alpha
Published: 2026-04-06 11:33 UTC

Why Oklahoma mesh operators should care

• ROUTER_LATE keeps getting smarter, with new congestion-scaling exemptions, telemetry behavior fixes, infrastructure init/config preservation, and router-like rebroadcast and power-management behavior. That matters for busy backbone and hilltop nodes.
• LoRa and RX behavior got attention, including LoRa parameter clamping, restored FEM LNA mode configuration, AGC reset work for SX126x and LR11x0 radios, and an SX1262 RX sensitivity patch for GC1109-based hardware.
• Mesh reliability improvements include dropping late packets from full TX queues, better telemetry broadcast behavior, malformed packet cleanup, and routing fixes around licensed vs unlicensed rebroadcast behavior.
• MQTT and gateway users benefit too, with faster first MapReport delivery, persistence fixes when brokers are unreachable, and socket exhaustion fixes that could affect gateway-style deployments.

Highlights from the release notes

• Fix(MQTT): Send first MapReport as soon as possible
• Align telemetry broadcast want_response behavior with traceroute
• Enhancement(mesh): remove late packets from tx queue when full
• Add some LoRa parameter clamping logic to coalesce to defaults and enforce bounds
• Add back FEM LNA mode configuration for LoRa
• Add ROUTER_LATE and TAK_TRACKER to congestion scaling exemption
• Add ROUTER_LATE to telemetry impolite role check
• Add ROUTER_LATE to infrastructure init and config preservation
• Apply SX1262 register patch for improved GC1109 RX sensitivity
• Implement AGC reset for SX126x and LR11x0 chip families
• Fix Bluetooth on RAK Ethernet Gateway
• Fix W5100S socket exhaustion blocking MQTT and additional TCP clients
• MQTT settings silently fail to persist when broker is unreachable
• Fix routing to prevent licensed users from rebroadcasting packets to or from unlicensed users

Downloads

• ESP32 firmware
• ESP32-S3 firmware
• nRF52840 firmware
• RP2040 firmware
• Full manifest / all builds

If you run production backbone nodes, I would treat this as a watch closely and test first build, not a blind fleet-wide upgrade. But there is enough routing, radio, and MQTT work here that serious operators will want it on the radar.

For the complete changelog and every board-specific asset, see the official GitHub release page.