November 4, 2026
- Updated CTR2-MIDI to v3.00.01. This version adds AetherSDR’s CTR2 Relay USB connectivity support to CTR2-MIDI hardware (ESP32-S3). This is not available for CTR2-Micro hardware (ESP32-C3) because that unit doesn’t support USB. Also fixes a bug with BTN1 in Flex mode when changing modes.
- Updated CTR2-Max to v2.00.01. This version fixes a USB issue that was causing CTR2-Max firmware to occasionally lock up when connected to AetherSDR’s CTR2 Relay app. It also adds additional time to the latching PTT timeout timer, fixes a bug that blocked the knobs from being used on the PTT page, and fixed a bug blocking buttons for CW macros 5 to 9 from operating.
CTR2 projects are constantly evolving. New features are being added and old features refined to make them easier to use. Users are intimately involved in the CTR2 evolution process and they’re helping to make good products great products!
Click one of the links below to download the latest software or manual. You can also visit the Download section for these links.
CTR2-Max
Download the latest CTR2-Max firmware and manuals here: v2.00.01 – October 28, 2026: Fixes a USB bug causing Max to occasionally lockup on AetherSDR’s CTR2 Relay. Adds more time to the latching PTT timer, fixes bug that blocked knobs from functioning in the PTT page, and fixed a bug blocking buttons for CW macros 5 to 9 from working.
CTR2-Flex/CTR2-Dial
Download the latest CTR2-Flex/CTR2-Dial firmware here: v2.05.06 – September 30, 2026: Fixes a bug that was deleting the map name in MIDI mode
Download the CTR2-Quad Hardware Manual here: v1.02 – April 15, 2026
Download the CTR2-Duo Hardware Manual here: v1.01 – April 15, 2026
Download the CTR2-Uno Hardware Manual here: v1.01 – February 13, 2026
Download the MIDI configuration files for CTR2-Dial here: October 18, 2026: Changed CTR2 settings file from the .TXT file extension to the .CTR2 extension
CTR2-MIDI
Download the CTR2-MIDI firmware here – v3.00.01, November 4, 2026: This version adds AetherSDR’s CTR2 Relay USB connectivity support to CTR2-MIDI hardware (ESP32-S3). This is not available for CTR2-Micro hardware (ESP32-C3) because that unit doesn’t support USB. Also fixes a bug with BTN1 in Flex mode when changing modes.
Download the CTR2-MIDI Operation Manuals here – v2.01.02- September 29, 2026. There are two manuals. One for CTR2-MIDI mode and one for CTR2-MIDI Flex WiFi mode.
Download the CTR2-MIDI Assembly Manual here – v1.00c – changed Allen wrench for knob setscrew from 1/16″ to 1.5mm
Download the MIDI configuration files for CTR2-MIDI here: v1.0 – January 23, 2026
CTR2-Micro
Download the CTR2-Micro firmware here v1.08.00 – July 4, 2026: This version includes a completely rewritten web server back-end. It now works on all modern browsers.
Download the CTR2-Micro Operation Manual here v1.08.00 – July 4, 2026
Download the CTR2-Micro Assembly Manual here Updated to v1.6a – changed Allen wrench for knob from 1/16″ to 1.5mm
CTR2-Voice
Download the CTR2-Voice firmware here – v1.01.03 – minor bug fix to announce Station WiFi setting on auto-connect startup
Download the CTR2-Voice Operation Manual here – v1.01.03
CTR2-Display
Download the CTR2-Display firmware here – v1.00.00 – initial release
CTR2-Mini/Mini+
Download the CTR2-Mini firmware here
Download the CTR2-Mini Operation Manual here
Each firmware download page tracks the changes for each update. If you have problems with the current version contact me so I can fix the bug.
73, Lynn, KU7Q