# Firmware Availability PN DEV-16771

**URL:** <https://community.sparkfun.com/t/firmware-availability-pn-dev-16771/69555>\
**Category:** Other\
**Created:** [September 10, 2026, 10:01pm UTC](https://community.sparkfun.com/t/firmware-availability-pn-dev-16771/69555 "2026-09-10T22:01:48Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![agjohnson](https://avatars.discourse-cdn.com/v4/letter/a/85e7bf/32.png) [@agjohnson](https://community.sparkfun.com/u/agjohnson)\
**Post date:** [September 10, 2026, 10:01pm UTC](https://community.sparkfun.com/t/firmware-availability-pn-dev-16771/69555/1 "2026-09-10T22:01:48Z")

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I need firmware information for part number DEV-16771.

1. Current Firmware Version?

2. How long will Maintenance be Offered for the Firmware?

3. When was the Firmware last updated?

4. Reason firmware was updated? (Obsolescence, Security, Bug Fixes, Other) Please explain update.

5. How often is firmware updated and when?

6. How are updates announced and distributed?

7. Additional Comments:

If the item does not contain firmware, or if it is a custom part made for a specific customer, that is all I need to know for that item. If the part number is incorrect, please provide the correct part number if possible.

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<div class="post-metadata">

**Author:** ![TS-Russell](https://yyz1.discourse-cdn.com/sparkfun/user_avatar/community.sparkfun.com/ts-russell/32/6092_2.png) [@TS-Russell](https://community.sparkfun.com/u/TS-Russell)\
**Post date:** [September 10, 2026, 10:37pm UTC](https://community.sparkfun.com/t/firmware-availability-pn-dev-16771/69555/2 "2026-09-10T22:37:53Z")

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Teensy 4.1 doesn’t ship with a fixed “application firmware” the way an IoT sensor or module might…it’s a bare microcontroller dev board. The only “firmware”-style pre-programming involved is the **USB bootloader** (which lets you flash your own code via the Teensy Loader/Teensyduino), plus whatever code the user eventually uploads

The bootloader itself is provided by PJRC and installed via the Teensy Loader tool, and [PJRC does publish periodic bootloader releases](https://micropython.org/download/TEENSY41/). The most recent is v1.29 released 2026-8-24, though there are variable gaps between the prior ones. There are also staging/preview versions of 1.30

You can also find more info at the following 2 links:

> **[Software - Teensy® 4.1](https://www.pjrc.com/store/teensy41.html#software)**
>
> This pinout reference card comes with Teensy 4.1.

> **[Teensyduino: Teensy support for Arduino IDE](https://www.pjrc.com/teensy/td_download.html)**