Miyoo Mini V3 20221216 or 20221224 Firmware Specific Guide for Onion OS

All documentation followed by Tai. These come w/ 20221216 or 20221224 firmware specific instructions for the Miyoo Mini V3

1. How to Use Higher Capacity MicroSD Cards on Miyoo V3

Skip this step if you're not using a microSD card bigger than 32GB. If you have a card higher than 32GB you'll have to format your higher capacity card in FAT32. I did this with Rufus in Windows. Video below shows you how to format.

2. Follow Onion OS Official Documenation

I followed the "Installing (on an empty SD card)" instructions since I wanted to use my bigger 256GB Samsung MicroSD card.

Official Onion OS GitHub Repository: https://github.com/OnionUI/Onion/wiki/Installation

Only install Onion OS v.4.0.4 or later for firmware versions starting with 20221216 or 20221224. If you don't you may encounter soft brick and have to recover w/ I2C methods. As long as you downloaded 4.0.4 or later you should be safe.

3. Upgrade Firmware from 20221216/2022124 to Hotfix Firmware

This is an important upgrade for our specific units running firmware 20221216XXXX or 20221224XXXX. Do not use this upgrade from any other firmware versions.

Why it is important?
* Reduces the startup time from 20s to 12s.
* Allows system settings to persist after reboot (this is only an issue on 20221216).

As of December 2022 Miyoo was no longer able to source the internal flash chip they were using so they sourced a new chip very similar in functionality, but they didn't immediately receive the additional drivers needed to enable full write functionality with this new chip. This is why the hotfix is solves the two issues above. Learn more here.

If you want to follow the official instructions it is here: https://www.reddit.com/r/MiyooMini/comments/104qbak/community_firmware_patch_for_new_devices/?sort=new