If you have OS 14B0E that's the most commonly used (and recommended) I believe.
Works with the GameKing 8.1r as well. But if you're loading the GameKing set, it's slightly different steps. I did it once and it worked fine. But it's slightly different. I posted the steps last year in another post.
I don't know why the Authentication Failure occurs. But the only way I've caused it is by loading games from boot with the ekey. Loading normal games after boot and it fixes it and it never happens again.
Here's the GameKing load steps that has always worked for me. I personally don't load it with other games. But if you do, load them after loading the GameKing set by itself using the ekey menu after boot.

For a GameKing load on AVP 3.0, it's the only one I know of that has the EZSETUP, kind of a 1 for all, and some 120 or so card games, roulette, and a few slot games but they aren't that great. This load is mainly for the card games.
It's one package to load, but it isn't just one game, it's a package of games, a theme, and it loads several feature packages for it.
The actual GameKing 8.3R game ID is Game014-001GKA-D02 (the R indicates it has Roulette) There is also a GameKing 8.3 that doesn't have Roulette. Where the game ID is Game014-001NW3-D11
To entirely wipe the machine and load the OS and the GameKing 8.3 or 8.3R so all works properly, it's slightly different than loading individual games after clearing the machine and loading the OS. You need to have the OS loader file, and the GameKing game loader file on two seperate USB flash drives. Both must be FAT32 formatted as with any game or OS loader flash drive for family 14.
The OS loader file recommended is OS version AI014BOE, the filename can vary but will have 14B0E in the name. The OS loader file is on one of the flash drives all by itself. The Gameking loader file is named something like igt_full_install-PI014001GKAD02-Game-King-8-3R (or similar), it can also be named with just the game ID such as PI014001GKAD02. That goes on the other flash drive all by itself. They have to be on separate flash drives and the flash drives must be FAT32 formatted.
But you must have to have the OS loader by itself on one flash drive, and the game loader by itself on another flash drive. If you're loading individual games instead this Gameking load, the steps are a little different. If you do it with these same steps and it isn't a Gameking load, you'll end up with the machine saying the drive failed authentication and you have to clear it and do it again.
Anyone with an AVP who has a diag & ekey, should always have that OS Loader flash drive and always keep it with your diag and ekey. As well as any game loader flash drives. Without them, you can't do a complete wipe and reload.
But to load a Gameking load, once you have the two USB flash drives with the OS and Gameking loader, you follow these steps to clear and reload it. I've done it many times without any problems, and the EZSETUP etc. works just fine, and the proper associated packages are all installed properly.
Steps for loading for a GameKing game set.
Boot with ekey and diag key. Wipe NVRAM, Safe Storage, and the SSD drive.
Turn off the machine, plug in the flash drive with just the OS loader 14B0E on it, and your ekey7 and power on.
The OS will install and report when it's done and says to reboot.
Turn off and remove the OS loader and ekey, and power on. It will boot normally, and follow the prompts, plug in your ekey, etc as you complete initial config of the machine until reaching “no games configured".
Then shut down. Now plug in USB flash drive with only the GameKing 8.3R loader, as well as your ekey, and power on. That will load the GameKing set and it's feature packages. Once it reports the load is complete. Power off, remove the loader and ekey.
Finally, power on again with no keys in. No games configured will come up. Plug in your ekey. And in the ekey menu, you can setup individual games from the set. Or select an "EZSETUP" option specific to a GameKing package loaded that will configure about 41 games for you as you did previously. But this is clearing everything, I suspect there's something corrupt on your SSD drive, so this will do a totally clean load of the OS and the Game.
You can also just enable games/denominations as you choose as well, it just takes longer so the EZSETUP is quick. After it configures, you can always edit what was set and enabled in the games if you choose. Then you can close it up so all doors indicate they're closed, and then it should run normally.