Update your Spektrum DSMR transmitter with SLT – DSMR

Posted: 2/20/25

The latest firmware update for Spektrum DSMR surface radios introduces a new SLT – DSMR technology that combines both protocols, allowing for a seamless connection between them. When installed, the update will let you link your Spektrum DSMR transmitter to the SLT receivers included with many popular ready-to-run models. You’ll be able to drive all of your RC vehicles using one transmitter. The firmware update is available now for the Spektrum programmable surface transmitters listed below.

SPM6420 iXSR 6-Channel with SR515 Receiver

SPM5025 DX5 Pro 5-Channel with SR2100 Receiver

SPMR5025 DX5 Pro 5-Channel Transmitter Only

SPM6215 DX6 Rugged 6-Channel with SR515 Receiver

SPMR6215G DX6 Rugged 6-Channel Transmitter Only, Green

SPMR6215O DX6 Rugged 6-Channel Transmitter Only, Orange

SPM6125 DX6C 6-Channel Transmitter with SR315 Receiver

SPMR6125 DX6C 6-Channel Transmitter Only

NOTE:This firmware update is not compatible with the DX5C and DX5 Rugged transmitters.

What does the SLT – DSMR firmware update do?

Although Spektrum DSMR is the premier 2.4GHz technology for RC surface models, you’ll still find radios using the SLT protocol in some ready-to-run vehicles from ARRMA, Axial, Losi, and other brands. The SLT radio equipment keeps these combo packages as affordable as possible for budget-minded drivers. But many of the vehicles are also hugely popular with experienced hobbyists who want to drive them with their feature-rich Spektrum DSMR transmitters.

With this firmware update, all of the Spektrum DSMR surface radios listed above are compatible with SLT protocol receivers. They become dual protocol transmitters that can bind both to DSMR and SLT equipped vehicles. Spektrum owners will be able to use their compatible DSMR transmitter with many of the hottest RTR vehicles running today — like the Mini-T, Mini-B, and NASCAR RC Race Cars from Losi; ARRMA GROM small-scale bashers; and Axial SCX24 platform micro crawlers.

If your RTR has special features like DSC (Dynamic Stability Control) or 1/24 scale 4WS, they will continue to be available with a compatible Spektrum DSMR transmitter and the firmware update.

Advantages of Spektrum DSMR programmable transmitters

If you’re currently driving an RTR using the SLT-only transmitter that came with it, the Spektrum SLT – DSMR firmware update means you can upgrade to a programmable Spektrum DSMR transmitter and use it to run your present vehicle — plus any others you may own in the future. With a Spektrum DSMR transmitter, you’ll enjoy all of the added features listed below.

Dual Protocol: Switch effortlessly between SLT and DSMR protocols with the firmware update

Superior Ergonomics: Drive longer and more comfortably, without hand fatigue

RaceWare Software: Easily customize and fine-tune settings for optimal performance

Model Memory: Use one transmitter to control all of your RC vehicles

Model Match: Recognizes and applies the correct settings for each model in your fleet

Future Proof: Spektrum keeps your transmitter updated with the latest software and innovations

How to get the Spektrum SLT – DSMR firmware update

The Spektrum SLT – DSMR firmware update is available to download now. Visit the MySpektrum website and log into your account. To update the DX6C and DX6 Rugged transmitters, you’ll need a PC and a USB-C cable. The DX5 Pro uses an SD card to update the firmware, while the iXSR is updated through the Google Play Store.