Hello here is a way that i have just used to fix my 900/1800 (O2) xda.
You first need a SD Card reader/writer and an SD card.
Download RSU_ENG.exe from here. -- SORRY URL NOT WORKING --
Run the .exe and unpack PROGRAMME B to a location.
Copy the RSUpgrade.sa.CAB file onto your SD card and then onto your XDA. Run the cab file and the program will install and then reset your XDA and then the upgrade process will begin.
I recommend taking out any SIM cards before upgrading cause it may stall it, but even if it does just soft reset and try again.
Hope this helps.
eladsalad
You first need a SD Card reader/writer and an SD card.
Download RSU_ENG.exe from here. -- SORRY URL NOT WORKING --
Run the .exe and unpack PROGRAMME B to a location.
Copy the RSUpgrade.sa.CAB file onto your SD card and then onto your XDA. Run the cab file and the program will install and then reset your XDA and then the upgrade process will begin.
I recommend taking out any SIM cards before upgrading cause it may stall it, but even if it does just soft reset and try again.
Hope this helps.
eladsalad