Thanks for the tips guys.
Mini Tutorial if anyone want to do the same:
Took nand backup using decrypt9,
Downloaded 3DNUS 3.0.1.1 alpha,
make sure you select old 3ds and save as .cia, searched for 11.2.0-35E it started to download a bunch of .cia files.
make a folder on root of sdcard calles...
Hey guys!
i have a old 3dsXL currently on 9.0.0.10E and i have installed Luma and all the bells and whisstles from https://3ds.guide/ and everything is working nicely.
Exept many games from the freeshop because they need 9.6+ because of a new encryption(?)
Would it be possible to install 11.2...
Rubbing alcohol is called Rød Sprit in Norway btw. they sell it at every petrol station. i have some bad experience to try to rinse with isopropanol because the stuff sold in Norway leave a white residue.