i5503t unlock done by octopus[Reference]
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model: i5503t (galaxy 5)
tools: octopus box,micro usb
-open octopus samsung tool
-tick samsung qualcomm and select right model
-Go to phone dial window
-Enter "*#9090#" number
-Set "Diag config" to "USB" value
-Restart phone
-Connect powered-on phone to PC via Micro USB cable
-Select "KIES" mode
-Click "Unlock" button
-Follow software instructions
-wait a few minutes
-done
model: i5503t (galaxy 5)
tools: octopus box,micro usb
-open octopus samsung tool
-tick samsung qualcomm and select right model
-Go to phone dial window
-Enter "*#9090#" number
-Set "Diag config" to "USB" value
-Restart phone
-Connect powered-on phone to PC via Micro USB cable
-Select "KIES" mode
-Click "Unlock" button
-Follow software instructions
-wait a few minutes
-done