MinUI is an extensible launcher
Source: https://github.com/shauninman/union-minui
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Following Instructions 101
Please read every step of the
relevant instructions before
undertaking the first step. A
little context goes a long way
towards understanding.
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Install
Where you copy the files in this zip file will depend on if you are using one or two SD cards (using two SD cards is recommended). If using one SD card, copy to the root of the ROMS partition of the SD card that goes in the TF1 slot. Otherwise copy to the root of the SD card that goes in the TF2 slot.
Step 1. Copy all the folders from this zip file to your SD card.
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Update
This extras zip file is included with every release, regardless of whether its contents has changed or not. Refer to the release notes to see what if anything was added or changed and copy just the updated pak(s) to the rg35xx folder in either the Emus or Tools folder.
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Bios files
You'll need to BYOB for the emulator paks included in this zip file.
MGBA: gba_bios.bin
sgb.bios
PKM: bios.min