Teensy 4.0

Vendor: PJRC
Features: Breadboard Friendly
Source on GitHub: mimxrt/TEENSY40
More info: Website

Installation instructions

For deploying the firmware use the Teensy Loader tool provided by PJRC on their web site. PJRC provides both a graphical and command line version for Windows, OS X and Linux. With the command line version, run the command:

teensy_loader_cli --mcu=imxrt1062 -v -w TEENSY40-<date_version_tag>.hex

or for Teensy 4.1:

teensy_loader_cli --mcu=imxrt1062 -v -w TEENSY41-<date_version_tag>.hex

Instead of imxrt1062 with the --mcu option, you can as well use the board specic names TEENSY40, TEENSY41 or TEENSY_MICROMOD. When loading the firmware the PJRC boot loader will erase the board file system.

Note: If the Teensy board is equipped with Teensy bootloader v1.07 and up, the first attempt to upload the firmware may fail. In that case try again.



v1.19.1 (2022-06-18) .hex [.bin] [Release notes] (latest)
v1.18 (2022-01-17) .hex [.bin] [Release notes]
v1.17 (2021-09-02) .hex [Release notes]

Nightly builds

v1.19.1-461-g282401da5 (2022-09-30) .hex [.bin]
v1.19.1-458-g65ab0ec91 (2022-09-29) .hex [.bin]
v1.19.1-456-gfecfbc3f6 (2022-09-29) .hex [.bin]
v1.19.1-455-ge4d90be68 (2022-09-29) .hex [.bin]