Penguinbait and the General have often given valuable advice here. However, in this case I don't think they understand the uncertainty the old man is facing. He is asking about the N810. Penguinbait stated

"This does not list the N810, I do not know if it is compatible. I do not have an n810 yet, nor do I have a mac." So the old man still does not have a pointer to instructions for (macosx AND N810).

The old man knows that a new flasher 3 is required for (linux AND N810). He cannot find anything to suggest that the old flasher-2 would work for (macosx AND N810). He has probably read here that one user thought flashing had trashed his internal card including his passport. So he is concerned and still seeks information. i too have read and still cannot find the information.

The best place for this is in the obvious place in the wikis. As I have commented previously, it would be very helpful if someone with experience could edit the maemo wiki or the ITT wiki. I have left a hook for this in the new FAQ problems and solutions section of the ITT wiki.
The absence of any responses suggests that the attempt is lethal.

(I just grepped '810' on the maemo wiki page for flashing the latest software using macosx and found nothing.)

One sentence, informed by experience, added to the wiki would save all the readers of ITT a lot of needless reading in future. Sentence added after inital post.

If I have missed it on the wiki, please let me know.