For Sale:  One (1) loaded 512 GB micro SD card for YOUR Android Tv Box (models "Beelink GT King" or "Beelink GT King Pro" or "Super Console X King which uses same box").... note: likely will not work on GT King II.  I built this card from scratch using the latest EmuElec 4.5 as the frontend/OS!   Basically plug n play solution here, all setup with my superior assets and expertise.  I repeat, this listing is for the loaded micro SD card only, which is basically plug-n-play.
 
If you have the Beelink GT King which can be bought for about $130 to $140 at AliExpress (or King Pro may be on Amazon), it is very simple to insert my card and use a toothpick in the tiny port on the bottom to depress the reset inside and hold it while plugging in power cord ON 1st BOOT ONLY... after that, the box will automatically boot up into EmuElec with my card inserted (the gaming frontend).  It's easy to exit EmuElec to the Android side of box if you wish, just be pressing Start on main menu, A on Quit, then A on Boot to NAND.  Then it boots up Android side.  My card is also recognized on Android side of box so the standalone N64 Emulator can be used over there too as example.   These boxes with my sd card offer awesome gaming with systems up to and including Dreamcast, Saturn, N64, Naomi, Atomiswave, Playstation, NDS, 3DO,,...and others.  I would say this box is better than a raspberry pi 4.  I highly recommend PS4 controller using bluetooth (pairs easily)... the knock off PS4 controllers I have used are great too.
 
I installed EmuElec 4.5 and added my superior game libraries with full menu art, got the ports working, added several awesome themes (some shown in pics), custom collections, added missing bios files, I optimized certain systems for this firmware,… I turned it in to the very best card set for the Beelink GT King.  Includes NDS, Sega Naomi, Sammy Atomiswave, Playstation, PSP, Arcade (FBNeo/MAME-2003plus), Dreamcast, Sega CD, SNES-MSU1, Saturn, 3DO, among many others as listed in detail below.
 
NOTE:  The games partition (EEROMS) is accessible directly in Windows on a PC for super easy game file transfers/mods/copying/pasting (nice benefit of EmuElec).
 
Games have video snap previews, mix/boxart, and wheel (header) art typical. Cheats have been 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 (class 10) micro SD card loaded for your box (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 sd card and a tip sheet.
 
There are awesome menu background themes loaded which can be easily switched up.  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).  Superior Arcade and Mame set, all with boxart and preview videos.  I setup game-specific bezel (sideart) to be displayed for almost every game... some bezels are system-specific.  I even included the vmu file and nvmem files so Marvel vs. Capcom 2 has ALL characters unlocked (for both Dreamcast & Naomi versions) - see my last photo for character screens.
 
I left about 1.5 GB free space on the 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 - ~17,800+ games
 
Arcade (FBneo) - 1831
Atomiswave – 17
Daphne - 15
MAME (Arcade) – 324
*Naomi - 117 (vs. 125 on 1 TB version)
Amiga - 645
Amstrad CPC - 211
Atari ST - ~305
Commodore 64 - 712
MSX - 635
MSX2 - 100
*ScummVM - 53  (vs. 85 on 1 TB version)
X68000 Sharp – 100
ZX Spectrum Sinclair - 182
*3DO - 38 (vs. 86 on 1 TB version)
Amiga CD32 - 133
Atari 2600 - 617
Atari 5200 - 96
Atari 7800 - 58
Atari 800 - 348
Colecovision - 141
*Dreamcast - 170 (vs. 285 on 1 TB version)
Famicom - 386
Famicom Disk System (FDS) - 128
Sega Genesis - 825
   Includes some Genesis Translations in submenu
Genesis Hacks - 215  (137 Sonic, 34 SOR2  &  44 misc.)
Intellivision - 136
Sega Master System - 277
Sega MegaDrive (Japan) - 191
Nintendo 64 (N64)  - 322 
    Includes N64 Hacks (20)
*Neo Geo CD - 2 (vs. 81 on 1 TB version)
Neo Geo (AES) - 140
Nintendo (NES) – 784
NES Hacks - 697
Odyssey2 (Videopac) - 85
PC Engine - 290
*PC Engine-CD - 47 (vs. 122 on 1 TB version)
*PC-FX - 2 (vs. 31 on 1 TB version)
*Sony PlayStation 1 (PSX) - 486 (vs. 543 on 1 TB version)
*Sega Saturn - 63 (vs. 322 on 1 TB version)
Sega Genesis 32x - 34
*Sega CD - 103 (vs. 134 on 1 TB version)
Super Famicom - 509
SG-1000 - 68
Super Nintendo (SNES) – 795+39+145
    Includes Satellaview (39) & Translations (145) in submenus
SNES Hacks - 64
*SNES-CD (MSU1) - 20 (vs. 167 on 1 TB version)
Solarus - 8
SuperGrafx - 5
TurboGrafx16 - 94
TurboGrafx16-CD - 45
Vectrex – 24
Virtual Boy - 25
OpenBOR - 127
Doom Ports - 4 (Doom Ultimate, Doom II, The Plutonium Experiment & TNT Evilution)
Other Ports -  26 games (and I setup menu art/vids for all)
Atari Lynx - 83
Nintendo Game & Watch - 52
Sega Game Gear - 259
Gameboy - 834
Gameboy Advance – 1106
     Includes 25 SGB (Super Game Boy) games in submenu
    Includes GBA Hacks in submenu
Gameboy Color – 572
    Includes GBC Hacks in submenu
*Nintendo DS (NDS) - 100 (vs. 307 on 1 TB version)
NeoGeo Pocket - 9
NeoGeo Pocket Color – 40
Pokemon Mini - 22
*Sony PSP - 114 (vs. 284 on 1 TB version)
Sony PSP Minis - 296
Watara Supervision - 44
Wonderswan - 110
Wonderswan Color - 89