For Sale:  One (1) loaded 512 GB micro SD card for your "XU Mini M" or also called "MagicX Mini M" handheld retro game system & ALSO includes a 64 GB card for the TF1 slot.  Plug the cards in and start gaming. These are plug n play. I use the best custom firmware (cfw) for this device, Knulli Scarab.
 
I added my superior game libraries with full menu art, added custom bezels for over 700 of the best VERTICAL Arcade games, added a ton of awesome ports with PortMaster, added/fixed lots of themes, tons of custom collections, added missing bios files, background music (can be turned off or switched out easily), I optimized certain systems , I added overlays for Vectrex… I turned it in to the very best card for the device.  Includes Playstation, PSP, Arcade (FBNeo/MAME-2003plus), Sega Dreamcast, Saturn, Sega Naomi, Sammy Atomiswave, Sega CD, SNES-MSU1, Megadrive-MSU, OpenBOR, Pico-8, among many others as listed in detail below.
 
33 awesome themes pre-installed. Also I fixed many features of the themes to have proper artwork, etc.
All themes were fixed to properly display all systems. Some of the themes I added include: Epic Szalik, Epic-Cody, EpicMAX-Cody, Farfenkugell-Crystal, SagaBox, Nes-Box, NesBox-Wood, Art-Book-Next, Carbon, Cody-Flux, Crazyboy, ComicScrap, Tiled, Freeplay, GBZ35_Mod, Knulli, RetroNeon, SagaWorld, Switch, Minimal (with lots of custom added selectable backgrounds), zSR-Cyber-City, zSR-Mario, zSR-Metroid, zSR-Morrigan, zSR-Morrigan2, zSR-PiranaPlant, zSR-Rogue, zSR-Ryu, zSR-Sonic, zSR-Tifa & zSR-Tifa2.
 
Approximately 17,000+ quality games including their game artwork and gamelists in the roms directory are installed (ex. Games have video snap previews, and boxart/mixart typical. Cheats are pre-installed available through the retroarch menu for many popular systems.
 
Below is a detailed listing of what is included with this purchase:
512 GB Sandisk micro SD card loaded and ready to game for TF2 slot + 64 GB for TF1 slot - for your "XU Mini M" aka "MagicX Mini M" handheld (Note: Samsung (EVO Select)) card(s) may be provided instead of the Sandisk brand depending on my stock). No hardware is included, just the loaded (plug-n-play) sd card set.
 
Games have video previews that play too as you scroll down through the game list on each system. Awesome menu background themes loaded which can be easily switched up. Most games allow saving game play at ANY spot within the game typical. Games can be identified as "Favorites" simply. Awesome "Custom Collections" are already setup and can be modified. The Arcade Favorites collections have hundreds of the best arcade games (from the thousand+ on system). Vectrex has awesome transparent overlays that I added which are missing on most systems.
 
BONUS: 
I loaded up the 64 GB card with "best of" collections.  Instructions:
Insert the 64 GB micro sd card into the TF1 slot and the larger (512 GB) micro sd card into the TF2 slot while device is OFF, and then press and hold power for 1-2 seconds and release to turn on.
 
The default setting for the 64 GB TF1 card is set to “Any External” for Roms/Bios/Settings, therefore it will only boot with a TF2 card installed as well as the TF1 card.  It’s possible to switch it back to “Internal”.  Click Start to open menu, then under “System Settings” go to “Storage Device” and you can switch from “Any External” to “Internal” (or back again).  Knulli will only look to find Roms/Bios/Settings on one or the other, not both.  I setup much of the empty space on the 64 GB TF1 card to have its own Bios/Roms/Settings, therefore it can be used alone in this way.  Games are sort of a “Best of” for certain systems but all are also present on the TF2 card.  The TF2 card can be used on other Knulli Scarab (OS) devices.
 
I left about 1.5 GB free space on the larger sd card available for smooth operation. 
 
This micro SD card has the following systems on it, and I list the approximate game count below:
System - approx. # Games Installed:
ALL - ~17,000+ games
 
ARCADE:
Atomiswave - 16 games
FB Neo - 1,829
MAME - 319
Naomi - 30
NeoGeo - 140 (also listed below)
 
COMPUTER SYSTEMS:
MSX - 635
MSX2 - 100
ScummVM - 48
Sharp X68000 - 116
 
CONSOLES:
Atari 2600 - 617
Atari 5200 - 96
Atari 7800 - 58
Channel F - 30
Colecovision - 141
Dreamcast (Sega) - 33
FDS (Nintendo) - 128
     In Submenu (Famicom) - 386
Intellivision - 136
LowResNX - 102
Master System (Sega) - 334
Genesis (Sega) - 1,231 (784 + 137 + 34 + 44 + 191 + 41) 
     In submenu: Genesis - Sonic Hacks - 137
     In submenu: Genesis Streets of Rage Hacks - 34
     In submenu: Genesis - Misc. Hacks - 44
     In submenu: Megadrive-Japan - 191
     In submenu: English Megadrive Translations - 41
Megadrive-MSU - 5
Nintendo 64 (N64) - 311
Neo Geo - 140
Neo Geo CD - 4
Nintendo (NES) – 843 (783 + 60)
     In submenu: NES Hacks - 60
Odyssey 2 - 85
NEC TurboGrafx-16 - 94
     In submenu: NEC PC-Engine - 290
NEC TurboGrafx-16 CD / PC Engine-CD - 31
Pico-8 - 131
PS1 (Sony PlayStation) - 593 !!!
Satellaview - 34
Saturn (Sega) - 23
Sega 32X - 34
Sega CD - 26
SG-1000 (Sega) - 68
Super Game Boy - 25
Super Nintendo (SNES) – 1,513 (795 + 64 + 509 + 145)
     In submenu: SNES Hacks - 64
     In submenu: Super Famicom - 509
     In submenu: SFC English Translations - 145
SNES-CD (MSU1) - 41
Sufami Turbo - 15
Super Grafx (NEC) - 5
Tic-80 - 1,028
Uzebox - 61
Vectrex - 24 (with overlays implemented)
Virtual Boy - 25
PyGame - 1 (Retro Trivia)
OpenBOR - 141
Ports - over 565 !!! (includes PrBoom - (Doom Ultimate, Doom II, TNT & Plutonia), Aliens vs Predator, AM2R, Axiom Verge, Balatro, Bleed 1&2, Celeste, Diablo-Hellfire, Duke Nukem 3D, GTA III, GTA Vice City, Hexen II, Iconoclasts, NAM, Need for Speed II SE, Oddworld..., Owlboy, Quakes, Shadow Warrior, Sonic 1, Sonic 2, Sonic CD, Sonic 3 AIR, Sonic Mania Plus, Stardew Valley, TMNT Shredder's Revenge, To the Moon, World War II GI ...plus many others! ...PortMaster included)
 
Lutro (in Ports submenu) - 6
Solarus Games (in Ports) - 8
 
 
HANDHELDS:
Arduboy - 233
Game & Watch - 59
Game Gear (Sega) - 259
Game Boy - 834
Gameboy Advance – 1,088(1,030 + 58)
     In submenu: 58 GBA Hacks
Gameboy Color – 573 (534 + 39)
     In submenu: 39 GBC (Pokemon) Hacks
Lynx (Atari) - 83
Mega Duck - 25
Nintendo DS (NDS) - 307
Neo Geo Pocket - 9
Neo Geo Pocket Color - 40
Pokemon Mini - 22
PSP (Sony) - 532 (228 PSP + 296 PSP-Minis)
     In submenu: PSP Minis - 296
Supervision - 44
WonderSwan - 117
WonderSwan Color - 100