Altering settings on a ME3000sp

Hi, as a newbie, I hope I am posting in the right place.
I have an ME3000sp that is working correctly, with 3 x Pylontech 2000 batteries.
However I would like to make some changes in settings and I am finding that there are some which I can initially alter, however if I exit and then return to that setting it has gone back to its ‘default’? setting. Is it possible to overide this. An example is ‘max Discharge Current’ seems to be set at 65A, and I cannot alter it to say 40A. I have recently upgraded to the latest ME3000 firmware.