Hi all. I'll try to cut a long story short! My Kindle 4NT was working perfectly with custom screensavers. Then I realised I couldn't update to 4.1 because of the custom screensavers. I attemped to follow some instructions to reverse the procedure so I can get it to update. Nothing would work, and now I don't have any screensavers at all, just a white screen.
After much digging around, I think the problem is that when copying and pasting certain commands off the web to paste into putty, for some reason the "x" between 600x800 was being changed to a "?"

. It took me a while to realise this, and now I think the reason I haven't got any wallpapers is because the kindle is looking for paths such as "mv mnt/base-mmc/opt/amazon/screen_saver/600×800", but it's all been changed to "mv mnt/base-mmc/opt/amazon/screen_saver/600
?800" for example. I'm pretty sure this is the problem, but I have no idea how to change the relevant paths back to "600
x800". Any help would be great, and in as simple terms as possible as i'm no expert at this by any means
Thanks!