وصلته على usb عادية
ونفس المشكلة

Selected model: I9100
Selected port:
Selected port speed: 115200
Reading phone info...
Model: GT-I9100
Android version: 2.3.3
Product code: Unknown
Phone version: Unknown
PDA version: I9100JPKF3
CSC version: I9100OJPKF2
IMEI: null
Phone S/N: Unknown
Checking Super user right... true
Writing EFS to phone... OK
Rebooting phone... OK
Searching Samsung modem... detected COM21
Waiting while modem will be ready...
No answer from phone
Done with Samsung Tool v.15.9