To my opinion RC 1.7 12/03/26 is more stable than 2/24/12 (I do not see new bugs introduced and some things have been improved.)
If you want to change screen savers, it might be bettter (safer) to put them directly to appropiate folder in firmware zip file before installing firmware. Using Tiny File Manager you may evidently make things go wrong... Like in your USB problem case.
My M92 has mini USB connector and not micro one. It's construction is good and firm. Does your M92 really have micro USB, or did you write it by mistake?
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