im using a usb and it works perfectly the wii just refuses to write to them
you can't say "it works perfectly" because that's your problem, you told yourself it's not working like you expect !
Flash drives (don't call them ***usb***) can't write !
use a Hard drive device (also ***usb***) and it will fix your problem.
note that "USB" is not a device type, it's a connector type.
HDD are USB
Flash drive/key are USB too
your problem is well known, it's because you use flash drive.
flash drive freeze when you try to write to them.
you can't say it works perfectly when it works only half (read but not write).
even if you say it works fine with another wii, it's still a known issue with many users using flash drives. your new console is not compatible with that flash drive.
you said it's "same result with hdd" ? are you sure you tested HDD ? because we can't help you if you lie, and we can't help you if it really is not working with HDD too. (not that we don't want to help you, but we don't have a solution if HDD are not working!)
you don't need cIOS236, and if you have an issue it's completely unrelated to your current write problem.
Please, don't install 236, it's not useful and no more homebrew will use it anyway.
You should reinstall d2x r52 base56 in your slot 249 (instead of r53) as r53 will have issues with some HDD and games too.