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Some newer firmware versions include "e-fuses" or software locks that prevent the bootloader from accepting an older version. Attempting to bypass this can result in a hard brick.
This involves creating a folder named dload on the root of the headset’s internal storage, placing the update file inside, and triggering the update via the system settings or a recovery boot (holding Volume Up + Power). Pico 4 Firmware Downgrade
If you buy a Pico 4 today and it comes with firmware v5.4.0, disable automatic updates immediately before connecting to the internet. Block the OTA domains before your first boot. This preserves the downgrade "option" (which is really just not upgrading). Some newer firmware versions include "e-fuses" or software
Have you successfully downgraded your Pico 4? Share your experience in the forums, but remember: One man's success story is another man's bricked headset. Always verify the MD5 hash of any firmware you download, and never run random .exe files promising an "easy downgrade." If you buy a Pico 4 today and it comes with firmware v5
However, the community is actively working on: