Should I remove any hax in my 3ds before do the downgrade ? Because i've actually menuhaxExactly. Non-modified 11.0 is not vulnerable to the exploit sysUpdater needs.
Do you mean DSiWare downgrade? If so, then you need another system and yes, a nand dump
Read above, NeTyd0.Dsiware
You can downgrade by using DSiWare or using a hardmod...Exactly. Non-modified 11.0 is not vulnerable to the exploit sysUpdater needs.