...about 5 months ago i took it to a shop and he repaired it
Well, then sorry to tell you that, but that shop didn't do the repair correctly.
I instaled the update and it worked perfectly before but now it doesnt
Yes, because the update specifically checks for problems with modified drive firmware. Since it is not known what the shop did do to your console, I assume the shop wrongly flashed a firmware to the DVD drive, and now future updates fail.
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