ExpressLRS 4.1 & Gemini X: True MIMO Diversity and Adaptive Data Rates Take Over RC
With the late August 2026 release of ExpressLRS 4.1, the open-source control link achieves rock-solid dynamic power calibration, eliminates spurious 'Telemetry Lost' warnings, and cements Gemini X dual-frequency diversity as the industry standard.
- Dynamic Power Refinements: Version 4.1 resolves edge-case packet drops, delivering continuous adaptive transmit power adjustment that scales between 10mW and 1000mW based on real-time link margin.
- Gemini X Concurrent Diversity: Transmits simultaneous packets across both 2.4GHz and 900MHz bands simultaneously, completely eliminating null zones caused by carbon-fiber shadowing during aggressive rolls.
- Configurator 2.0 Overhaul: Unified web-serial flashing interface with cloud-based hardware target discovery makes flashing dual-core ESP32 and LR1121 transceivers seamless.
The transition from closed commercial RC protocols to open-source architectures is complete. When ExpressLRS rolled out version 4.0 earlier this year, it made the bold move of breaking backwards compatibility to strip legacy STM32 code and unlock true MIMO transmission.
The arrival of ExpressLRS 4.1 in late August 2026 polishes that foundation into peak competitive form. Pilots who experienced occasional false 'Telemetry Lost' voice alerts during low-altitude proximity maneuvers report that the revised dynamic power hysteresis algorithms in 4.1 completely eliminate erratic telemetry dropouts.
“We no longer debate packet rates. With 1000Hz full-resolution 16-channel telemetry operating across dual frequencies simultaneously, legacy commercial radio systems feel like dial-up internet.”
By leveraging hardware targets built on dual Semtech SX1280 or sub-GHz LR1121 transceivers, Gemini X ensures that even if one antenna is occluded behind a 6S LiPo battery, the secondary antenna receives the packet intact with sub-millisecond latency.