Download the firmware (RX-51_2009SE_2.2009.51-1_PR_COMBINED_MR0_ARM.bin) and the eMMC VANILLA one (note that you have to install the old version - RX-51_2009SE_1.2009.41-1.VANILLA_PR_EMMC_MR0_ARM.bin).
Install the eMMC first and then the last combined firmware later.
Enjoy!
Pd: Don't forget to backup previusly... this will leave your N900 like out of the box
hi guys that was great and thank you very much. i hope that there will be some other way to increase the application storage space or make use of the memory.