Ok.. now we have something to work on that shouldn't brick your player.
Try this:
Go to this link >
http://www.mympxplayer.org/amv-conve...mod-df541.html and download this modified version of AMV Converter v4.0.
Although version 4.09 is a more recent version it seems to have a bug. Instead of converting to 160x120 it turns it into a 128x176.. weird.
Anyway the modified version of 4.0 will still convert your videos to 16fps but will give you true 160x120.(I've noticed with a certain 1.8" player anything other than 160x120 makes it do weird things)
Next, to convert the file with a rotation of 90deg clockwise, go to the folder it's installed into. Find a file called AmvTransform.ini and change the line that says "BMPADJUST=0" to "BMPADJUST=4" and save it. If you want to rotate the movie 90deg anti-clockwise then change the number to 5. Then start the program and convert your movies. You won't have to make any other settings changes, once you've chosen your file to convert, just go ahead and convert it.
if that doesn't work, we'll have a look at actually changing the frame rate.
Post your results here
cheers