Are your referring to the channel guide or the channel list? No matter as if you update one it also updates the other.
GUIDE >> Red >> TV >> Numeric
While in the EPG first press the Red button and then select ‘TV’ from the menu this will give you the choice of the ordering.
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OR
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LIST >> the right button to the right of ‘OK’ >> TV >> Numeric
While viewing the LIST of channels first press the right button to the right of the ‘OK’ button then select your Group of choice from the menu as this will give you the choice of the ordering.