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Waiting ADB device... OK
Reading phone info...
Model: SM-G935S
Android version: 8.0.0
PDA version: G935SKSU3ETJ1
CSC version: G935SSKC3ETJ1
Phone version: G935SKSU3ETJ1
Product code:
CSC country code: KOREA
CSC sales code: SKC
Phone SN: R39H30JWES
IMEI: 355647070820955
HW version: REV0.8
RF cal date: 20160319
Chip name: EXYNOS8890
Modem board: SHANNON335
Security patch: 2020-10-01
Boot Warranty bit: 1
SIM State: ABSENT
Initialization zTool... OK
Running zTool, please wait... OK
Reading data from phone... error (0 5.2)
Reboot phone and try again.
Check ADB drivers, USB cable. Don't use USB Hubs
If this repeated then reflash phone and make factory reset.

Done with Samsung Tool PRO v.44.11 [SM-G935S,Write CERT Aug 2019]
in General questions by (940 points)

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