for those having problems flashing their rootfs I have now an N9 that have this problem i got the "mmc: sfdisk returned status 1" error also when using the moslo kernel to mount the eMMC I got errors on accessing the partitions I remembered i had a similar problem happen on my last N900 (flashing the rootfs failing) the solution was to remove the battery for a one day or two and the retry flash and it worked the N900 was also because of battery drain so somehow the battery cause the eMMC to not work proprely I have disconnected the battery from my 16G N9 ( I bought another one with 64G ) and I'll report in 2 days