circuitpython/ports/mimxrt/boards/deploy_teensy.md

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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:
```bash
teensy_loader_cli --mcu=imxrt1062 -v -w TEENSY40-<date_version_tag>.hex
```
or for Teensy 4.1:
```bash
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.