I had exactly the same problem as you,what i did to resolve it was i updated my emunand to 6.2 with ChoiDujourNXv101 when on sx 2.3 then powered off and put 2.4.1 on sd card then booted into 2.4.1 and 2.5 as well and everything still works fine.
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I dumped my sd card on to my pc before i...