Serial : XAJ4005318xxxx
Serial on device matches serial on box: yes
Firmware : 4.x
Store : Local
Region : JP
Was a bundle : no
Purchase date: 2018
Color Option : neon/blue
Fusée Gelée works:Yes!
@theory18 your second partition is ext4, its normal windows cant read and asked you to format it. Use something like ext2fsd to read the partition
Maybe you can try to reflash img file or use other sd (?)
n1dus and zerotwoxci not working on latest fw, for 4nxci maybe you can go here https://gbatemp.net/threads/official-4nxci-a-tool-for-converting-xci-to-nsp.515341/