Now I am not an expert on Rockbox, but have used e280 for a couple of years. About a year ago I installed a previous version of Rockbox. I was a little dissapointed, removed everything using format in explorer, then using Sansa firmware updater to get orginal firmware back. Now I have tried version 3.2 and what a pleasant surprise.....

. This times Rockbox really rules. First, orginal firmware do not support extra miniSD very well. Now I just installed an extra 8 gb miniSD HC card. Note that I have a Version 01.xx.xxx player. I runs perfect and the database updates perfectly. Many skins to chose from. The best is the plugin MP4 player.
Thank you so much to the development team. You have really made improvements. My contribution from palpay is on its way.
Just a tip: The Sansa player has to modes for USB. Both MTP and MSC. The player must be in MSC when tranfering files to player. Also note that as Rockbox don't support USB tranfer, they use orginal firmware support during tranfer. This means that if you have a mini SD card larger than 2 gB, you should use a separat card reader to tranfer you music or MP4 files using explorer in windows. Mine run on 8 Gb, but I probablly would also support 16 gB card.
A second tip: You may format the e280 when getting in to trouble. The firmware is safely located in a separatly. Of course, you lose all your files and file structure, and playlist - but as an final sollution it may work also for you.