help in upgrating ot-990 please

[Guest EgyptoBoy]

i have a ot-990 with stock 2.2.2 froyo now im trying to upgrade to 2.3 via

but in the first step in 38% it stopped (failed in reading information) what can i do to upgrade it to stock 2.3.4 gingerbread via OTU

i need help please??