# PiicoDev doesn't work with the latest Pi Pico W firmware

**URL:** <https://forum.core-electronics.com.au/t/piicodev-doesnt-work-with-the-latest-pi-pico-w-firmware/15216>\
**Category:** Core Electronics\
**Created:** [28 September 2022 01:59 UTC](https://forum.core-electronics.com.au/t/piicodev-doesnt-work-with-the-latest-pi-pico-w-firmware/15216 "2022-09-28T01:59:08Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Steven](https://avatars.discourse-cdn.com/v4/letter/s/94ad74/32.png) [@Steven](https://forum.core-electronics.com.au/u/Steven)\
**Post date:** [28 September 2022 01:59 UTC](https://forum.core-electronics.com.au/t/piicodev-doesnt-work-with-the-latest-pi-pico-w-firmware/15216/1 "2022-09-28T01:59:08Z")

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I couldn’t get my Piicodev modules to work with Pi Pico Ws running the latest firmware downloaded from the Raspberry Pi website (`rp2-pico-w-20220926-unstable-v1.19.1-451-gbdbc44474.uf2`), as it throws a communication error.

Downgrading to `rp2-pico-w-20220908-unstable-v1.19.1-378-g24678fe45.uf2` fixed the problem for me.

This could be an isolated incident, but in any case I hope this is helpful for anyone facing the same problem.

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**Author:** ![Liam](https://yyz2.discourse-cdn.com/flex028/user_avatar/forum.core-electronics.com.au/liam/32/3562_2.png) [@Liam](https://forum.core-electronics.com.au/u/Liam)\
**Post date:** [28 September 2022 03:53 UTC](https://forum.core-electronics.com.au/t/piicodev-doesnt-work-with-the-latest-pi-pico-w-firmware/15216/2 "2022-09-28T03:53:22Z")

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Hi Steven,

Yeah we’ve had a few reports - James made a topic regarding just this!

> [@Raspberry Pi Pico W I2C/Piicodev Bug \[Solved\]](https://forum.core-electronics.com.au/t/raspberry-pi-pico-w-i2c-piicodev-bug-solved/15206):
>
> Hi Guys, We’ve had a few reports of I2C issues with the Pi Pico W (i.e. when using PiicoDev gear), shown below: We believe this is due to bugs in recent MicroPython builds. Below is a nightly build we have verified to work: [rp2-pico-w-20220831-unstable-v1.19.1-358-g0b26efe73.uf2.zip](https://forum.core-electronics.com.au/uploads/short-url/znw1c65BZBo4rrLfGhPvd7saN6U.zip) (495.8 KB) Just extract it and copy it over to your Pico as you did when you first set up MicroPython. Here’s an image of us using this build with a PiicoDev BME280: L…

Once a stable release comes out we’ll be all good!

Liam