I also have a samsung e250 and i followed these instruction and it worked...
You must download two programs the SoftickPPP which you can download in this link: (if this link is not working try google you can find many sources) http://users.skynet.be/yozy/tutorials/downloads/SoftickPPP234-en.exe
last is the uploader.exe http://users.skynet.be/yozy/tutorials/downloads/Uploader.exe
Download the 2 programs and install the first program configure its setting on bluetooth/serial and choose the general serial port you are using for example: \device\mdm0 then press OK
Your fone must be connected to the pc via bluetooth or usb cable.
open uploader.exe and add the jad file of the game you want to install... then activate softick, which you can see in the taskbar right click the green icon and select activate softick.
type *#52828378# on your telefone
OTA type setting
Serial bearer OTA
activate SoftickPPP which you can see in the taskbar right click the green icon and select activate softick.
type #*5737425# on telephone
choose usb port (if you are connected via usb cable) or bluetooth
(sometimes the fone restarts during this procedure, just inactivate your softick while the fone restarts and activate it again...
you can see java screen when the game is being uploaded...
if you still have questions email me at firstname.lastname@example.org