No worries.
Looking forward to your updates.
so i borrowed an official original cable from a friend ,and used it to do the restore,and always the same error.
now what i've noticed is that:
1-when the phone is not connected to a charging usb cable:
The phone won't turn on when i press the power button.
i am sure the battery itself is fine because its a good battery from another phone.
2-when i hook it to the charging usb cable :
the phone shows the itunes logo with the cable
itunes pops on my imac telling me that i need to update and restore
i do this and when i get the error 50. i click Ok on the message
then the phone disconnect from itunes on its own. i cannot see it with itunes anymore
and on the phone screen the apple logo is frozen and the restore bar at the middle.
when i use Recboot , it finds the iphone in recovery mode. so i hit get out of recovery.the iphone restart, i see the apple logo then shuts off again..
also when itunes first recognize the phone. i cannot see the imei , i only see the serial number and the ecid
i took out the logic board and put it in another health iphone 4s,same problem. so i dont think there is a problem with the other hardware parts of the phone other then the logic board itself.
i hope i was clear in the explanations