Hello,

I am meeting the exactly the same problem. I bought the phone used. There was some trials to see the Nitdroid and MeeGo. After that I cleaned all the apps except gainroot. Decided to flash eMMC image and then the "combined" one.
I have read several times the wiki and some additional explanation. Then I have edited the bin file to enlarge the /home part. It is according to the explanation here (http://talk.maemo.org/showthread.php?t=35122&page=24). Using Hex editor.
I saved the new bin file. I have put the file in the flasher-3.5 folder with short name RX_51van.bin.
Then started the flashing and it freezes on 20% something and that is all.
See the cmd screen:
"C:\Documents and Settings\Darkice_FS2>cd C:\Program Files\maemo\flasher-3.5

C:\Program Files\maemo\flasher-3.5>flasher-3.5.exe -F RX_51van.bin -f
flasher v2.5.2 (Sep 24 2009)

Image 'mmc', size 255947 kB
Version RX-51_2009SE_10.2010.13-2.VANILLA
Suitable USB device not found, waiting.
USB device found found at bus bus-0, device address \\.\libusb0-0001--0x0421-0x0
105.
Found device RX-51, hardware revision 2101
NOLO version 1.4.14
Version of 'sw-release': RX-51_2009SE_21.2011.38-1_PR_MR0
Booting device into flash mode.
Suitable USB device not found, waiting.
USB device found found at bus bus-0, device address \\.\libusb0-0001--0x0421-0x0
1c8.
Raw data transfer EP found at EP2.
[init 20 % 12288 / 255947 kB 16384 kB/s]"
I have repeated the step several times. But no sucess.
After such unsuccessful flashing Maemo boots in strange stage - no images and texts. I am lucky that I know the steps of booting and what shoul be the questions and buttons.
I start the phone and succeeded to reinstal via Nokia Suite. But if I try to flash the phone the things are repeating the same.
During these trials I have tested all 4 USB ports of tha laptop but nothing changed.
Also I have googled the case and just here I am finding the same problem discussed.
If I am able to find good good instruction for the "cold flash" I will try to make it. During this time I will watch the theme and I someone find what is the cause of the flashing problem it will be nice.

Last 30 minutes I have tried the same thing in Win7x32. My laptop is dualboot WinXPsp3/Win7x32. The situation has repeated. I do believe that it is something with the phone but don't know what. Please, help. Be aware that I am newbie in the linux systems.