# Old unicorn hat "P2288" on Pi - mostly not working - specs?

**URL:** <https://forums.pimoroni.com/t/old-unicorn-hat-p2288-on-pi-mostly-not-working-specs/20736>\
**Category:** Support\
**Created:** [November 17, 2022, 4:17am UTC](https://forums.pimoroni.com/t/old-unicorn-hat-p2288-on-pi-mostly-not-working-specs/20736 "2022-11-17T04:17:25Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![cphoenix](https://avatars.discourse-cdn.com/v4/letter/c/dfb087/32.png) [@cphoenix](https://forums.pimoroni.com/u/cphoenix)\
**Post date:** [November 17, 2022, 4:17am UTC](https://forums.pimoroni.com/t/old-unicorn-hat-p2288-on-pi-mostly-not-working-specs/20736/1 "2022-11-17T04:17:25Z")

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I have a “P2288” unicorn hat from Adafruit, apparently made in 2016. When I put it on my Raspberry Pi 3B, it doesn’t light up when I power it on. When I run Pimoroni/unicornhat/examples/phat/rainbow.pi, a couple of the pixels flicker briefly, but examples/simple.py does nothing even when I change the set\_layout to unicorn.PHAT.

Is there any way to get this running, or is it simply too old and unsupported? Thanks!

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**Author:** ![hel](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/hel/32/6075_2.png) [@hel](https://forums.pimoroni.com/u/hel)\
**Post date:** [November 17, 2022, 10:20am UTC](https://forums.pimoroni.com/t/old-unicorn-hat-p2288-on-pi-mostly-not-working-specs/20736/2 "2022-11-17T10:20:59Z")

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I don’t think there are any changes that mean older Unicorn HATs shouldn’t work - try disabling onboard audio by commenting out `dtparam=audio=on` in `/boot/config.txt` ?

> <https://github.com/pimoroni/unicorn-hat/issues/148>
>
> Something seems to be awry when running a recent version of Raspberry Pi OS on o…lder Pis - only the first few LEDs light up when running the examples.
> 
> !\[PXL\_20211020\_154126729 (1)\](https://user-images.githubusercontent.com/50950368/138130151-b1af7cb4-ed6c-4940-9a5c-f9c0aed01163.jpg)
> 
> I'm getting this with 2021-05-07 Buster Desktop, on a 3B and a 3B+. The examples work fine with the same SD card image on a Pi 4.

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<div class="post-metadata">

**Author:** ![cphoenix](https://avatars.discourse-cdn.com/v4/letter/c/dfb087/32.png) [@cphoenix](https://forums.pimoroni.com/u/cphoenix)\
**Post date:** [November 18, 2022, 6:44am UTC](https://forums.pimoroni.com/t/old-unicorn-hat-p2288-on-pi-mostly-not-working-specs/20736/3 "2022-11-18T06:44:29Z")

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Commenting out that line solved the problem. Many thanks!