We have a new Firmware, 1.5.8. Instructions for the update are included with the download.
Improvements with this firmware:
1. Increased memory size for user data partition. This allows more artwork to be stored.
2. Increased embedded ID3 artwork size to be 900*900 pixels maximum. This helps to avoid a media scan crash problem and improves the media scan speed.
3. Rectified the sorting order bug.
Link for the update. 1.5.8
I just hope that sound-wise, it will be exactly the same, as 1.5.2.