So. I'm facing a really really weird problem. My friends brings me his New 3DS XL out of box. Fw 9.6 I downgraded. Format emuNAND and setup Luma3DS 5.5. Menuhax Injected fbi 2.6. All ok. Everything fine. But when i tried to install sysupdater to update offline to 11.0 its toke a long time to start installing and stays at 0Mib But after some time installed. I updated to 11.0 offline mode with sysupdater. Well the problem its. Anything i tried to install its toke long time to start installing. And its slow. Very slow. Its a 64Gb microsd SDXC 48MBS When copying game was fast about 15mb/s. I tried a lot of games. Anything even small ones are slow. Well i have my own new 3ds and the same microsd. Its big difference of speedy with same games. Ok. So i decided to start from beginning. Format emuNAND again but wait. New 3ds just freeze and cant format emuNAND anymore. So i got microsd into my notebook format it and exclude emunand partition but still can't create emunand anymore. So i have a great idea of backup my own new 3ds xl microsd. And use with his new 3ds. The same problem occurs. Now i cant even create emuNAND with my own card too. Even into my own new 3ds. I toke another microsd and format emuNAND into my new 3ds and works well everything back to normal. But now i have 2 microsd that was working great not accepting format emuNAND. I dont know whats going wrong. Maybe his new 3ds are corrupting the microsd? Before everyone says. Its a original microsd sdxc 64gb from sandisk. Its no fake. If it was fake should not even working with my new 3ds with 40gib games installed. Sorry for long history. But im really upset with this.