HiI followed the instructions posted on this site and very successfully upgraded my firmware to 1.7.4. The aim of this was to get Market, mainly to get an eReader which lets me read the books I want. The new firmware works well and I can get market, although an inbuilt bug means it's pretty darned awkward to do downloads. Nevertheless, I've got the major apps I needed. Thanks to mp4doggie and others for highlighting the upgrade and leaving instructions on how to get round the dl problems. This is a great site.