All you can do is try, uing the same principles as detailed although the exact layout may be different.

HOWEVER, as posted on the other forum by a well repected member:-
"You have this "One 125 1GB (V8, One30 series)". To my knowledge are memory extension instructions only aviable for ONE-3rd (only the 512MB version, not the 1 GB!) and some ONE XL, but not for these One30/40 series. And of course the HD-replacements for Go 700 and Go 910."

...so really it's up to you if you want to try this but as the newer x20/x30/x40/x50 devices are pretty cheap now it may be worth retiring that and getting something else?