return to stock - galaxy ace (S5830)

was helping a friend to flash back stock rom to the phone (galaxy ace / S5830)

as always i do on my galaxy tab i thought will be just 

1) start in download mode 

2) start odin & flash with the firmware from http://www.sammobile.com/

3) done !

and I was so wrong :) 

I always getting the connection error / setup fail .. i've tried using various version of odin v1.85 - 4.38

And I first thought that it could be the usb driver is having issue or there is anti-virus blocking it !

After all it need is just the Cooper_v1.0.ops to be loaded and it work like charm :)

** For those who struggling to get Odin to work on your ACE / S5830 , please do download the ops file and load at the OPS section