Important Note!!!

Tip:

Because StockOS has modified the underlying button driver, this update only supports lossless upgrade packages for RG28xx, while other models can only be upgraded by refreshing the TF card
When using balenaEtcher flash TF under MacOS system, automatic partitioning will fail. It is recommended to use rufus flash TF under windows.
The system needs to install data on the first boot, Please be patient and do not manually shut down or restart.
Upgrading the upgrade package may cause problems with some functions. If you encounter this situation, please use a new image to flash TF.

Added LR key to switch previous/next song when closing the cover of the music player
The cover does not sleep when closing the cover under HDMI function
Fixed known bugs

Used to create a brand new system for TF1, After flashing, all the original data of TF1 will be lost. Please make a backup in advance.

Download the corresponding OS_image file according to the model
Decompress the image
Write the image to an SDCARD using an imaging tool. Common imaging tools include Rufus, Balena Etcher, Raspberry Pi Imager, and Win32 Disk Imager. If you're skilled with the command line, dd works fine too.

Support both Stock OS and Stock OS MOD system upgrades simultaneously, Require the system version before upgrading to be no less than 20231212.

Download the Update_Package
Decompress the Update_Package to obtain the APPS folder
Copy the "APPS" folder to the "Roms" folder in the TF 1 or TF 2 card game partition
After booting up, enter "RA Game", find the corresponding "APPS" simulator, and run "RG35xxX_Upgrade_202xxxxx" inside it
Follow the prompts to complete the system upgrade
The first restart may take a longer time, please be patient and wait

Go up a directory and download the folder. Google Drive will make a zip of this folder and allow you to download that instead.