Here is a quick write-up on how to re-purpose SS4200 with DSM 5.0
1) Create USB stick with gnoboot-alpha10.5-ext2.img
2) Modify files on USB stick(Ext2 file system) - use Linux, previous version of DSM, install Ext2 drivers for windows, etc...
2a) Modify menu.lst
default 1
timeout 0
fallback 1
title gnoboot-alpha
configfile (hd0,0)/boot/grub/menu_alpha.lst
title gnoboot.me
configfile (hd0,0)/boot/grub/menu_me.lst
title gnoboot-debug
configfile (hd0,0)/boot/grub/menu_debug.lst
2b) Modify menu_me.lst
timeout 0
default 0
fallback 0
title gnoboot-5.0-4458 (install/upgrade/downgrade)
root (hd0,0)
kernel /zImage gnoboot_me=5.0-4458
title gnoboot-4.3-3827 (install/upgrade/downgrade)
root (hd0,0)
kernel /zImage gnoboot_me=4.3-3827
title main menu
configfile (hd0,0)/boot/grub/menu.lst
3) Insert USB stick into SS4200 and press and hold the RESET button in the back of the unit while you power on the server (I have modified the RESET button to be permanently pressed)
4) After 1 min launch the Synology Assistant and you will find the SS4200 with the DSM 5.0 ready to be migrated
5) Double-click and follow the DSM install as described in other write-ups. In my upgrade the migration preserved all the data but I had full 100% backup of all the drives.
6) When SS4200 reboots and the fans start up high speed shut it down with the power button. Remove the USB stick and reload the original gnoboot-alpha10.5-ext2.img (Do not modify any files)
7) Insert the USB stick back into the SS4200 and power up with the RESET button held down
8) Be patient and let the DB be upgraded and all services started (launch Synology Assistant and keep on checking until DSM 5.0 is READY)
9) Your good old SS4200 is ready.