# Retroarch says bios files are missing - RG34XX

**URL:** https://community.muos.dev/t/retroarch-says-bios-files-are-missing-rg34xx/1449
**Category:** 2601 Jacaranda
**Tags:** retroarch
**Created:** [April 3, 2026, 1:09pm UTC](https://community.muos.dev/t/retroarch-says-bios-files-are-missing-rg34xx/1449 "2026-04-03T13:09:42Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![bgelmini](https://community.muos.dev/user_avatar/community.muos.dev/bgelmini/32/23_2.png) [@bgelmini](https://community.muos.dev/u/bgelmini)
#### Post date: [April 3, 2026, 5:43pm UTC](https://community.muos.dev/t/retroarch-says-bios-files-are-missing-rg34xx/1449/2 "2026-04-03T17:43:23Z")

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Bios files should go in `/muos/bios`  
On sd1 or sd2  
If a `/muos/bios` folder is present on sd2, `/run/muos/storage/bios` will read from that folder, if not, it will read from sd1.

If you have a valid and named correctly gba bios on `/muos/bios` it will be detected without issues.

There’s a section about bios in here:

> [@How to add more content](https://community.muos.dev/t/how-to-add-more-content/297#p-1069-what-about-bios-filesbios-10):
>
> [How should I name my content folders?](#default_folders) muOS does not have any default names for content. Other firmwares might need a strict structure, but we do not. [So where do I put my content?](#content_location) One of the key differentiators between muOS and other CFW’s is its flexibility with content storage. Essentially, it mostly doesn’t care where you put things. Important The only firm rule is that all your content must be in sub-folders under a folder named roms. This can be on SD1, SD2 or both. Content structur…

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