Gaming Repeated error code 0xd900458b in Pokemon Sun, KH3, +?

[MFoogle]

Hello everyone. I just bought a 3DS on Ebay recently. The 3DS was working great, but when I started playing Pokemon Sun (preloaded), the game keeps glitching like crazy. I also recently played Kingdom Hearts 3D, and at first it was working fine, but it now just glitched an hour or so into the game.

In both games, when I change the scene (finish a battle, enter a building, etc.), it will often give this glitch and need to reboot the game. In Sun, it will keep happening unless I tweak something minor within the game, like changing a Pokemon order in my party or using an item (not sure about KH).

I'm playing on a Sys 11.5.0-38U New 3DS XL. I was asked in another thread if it has Custom Firmware, and unfortunately I'm not sure.

Since it's happening with both games I've started playing, I assume it's an issue with the console? Can anyone please tell me how to fix this?

(Also, I am just a casual gamer, and am very unfamiliar with a lot of the hardware and technical terms, etc. often used in these forums. Apologies [and thank you] in advance.)

Details (photos attached):

Pokemon Sun
(ErrDisp)
Error Type: generic
Process ID: 39
Process name: niji_loc
Process title ID: 0x0004000000164800
Address: 0x0033e6c8
Error code: 0xd900458b

KH3D
(ErrDisp)
Error Type: generic
Process ID: 39
Process name: KH3D
Process title ID: 0x000400000008d300
Address: 0x001a4810
Error code:
Error code: 0xd900458b

 

[Gcentrex]

After taking a quick google I found this;

0xD900458B = Invalid RomFS / savedata block hash.

Seems something is wrong with those two games, also contact the seller and see if it has CFW or not