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Hello. Supported, use checkphones.

https://z3x-team.com/check-your-phone/?
by (118k points)
Checking Login and Password... OK
Balance: 25 crd.
You have 25 credit(s) left. This operation takes 5 credits. Continue?  Yes
Waiting for device to become ready... OK
Reading phone info...
Model: SM-G960U
Android version: 10
PDA version: G960USQU9FUB5
CSC version: G960UOYN9FUB5
Phone version: G960USQU9FUB5
Product code: SM-G960UZKAATT
CSC country code: USA
CSC sales code: ATT
Carrier ID: ATT
Phone SN:
IMEI:
HW version: REV1.1
RF cal date: 2021.08.24
Chip name: SDM845
Modem board: SDM845
Security patch: 2021-03-01
Boot Warranty bit: 0
SIM State: ABSENT
Rebooting phone... OK
Waiting ADB device... OK
Rebooting phone... OK
Waiting ADB device... OK
Waiting for device to become ready... OK
Initialization zTool... OK
Running zTool, please wait... OK
Trying to enable diag port... OK
Waiting ADB device... OK
Waiting for device to become ready... OK
Searching Samsung diag port... detected COM24
Initialization zTool Loader... OK
Running zTool, please wait... OK
Loading... OK
Initialization zTool... OK
Running zTool, please wait... OK
Executing... OK
Searching Ramdump interface... COM35 detected
Reading data from phone... OK
Calculating... OK
Searching server... error
 could not connect to server

Done with Samsung Tool PRO v.44.4 [SM-G960U,Read Codes via Server]
Repeat operation once again. Try disable firewall or svitch isp if got same error.
Reading phone info...
Model: SM-G960U
Android version: 10
PDA version: G960USQU9FUB5
CSC version: G960UOYN9FUB5
Phone version: G960USQU9FUB5
Product code: SM-G960UZKAATT
CSC country code: USA
CSC sales code: ATT
Carrier ID: ATT
Phone SN:
IMEI:
HW version: REV1.1
RF cal date: 2021.08.24
Chip name: SDM845
Modem board: SDM845
Security patch: 2021-03-01
Boot Warranty bit: 0
SIM State: ABSENT
Initialization zTool... OK
Running zTool, please wait... OK
Trying to enable diag port... OK
Waiting ADB device... OK
Waiting for device to become ready... OK
Searching Samsung diag port... detected COM24
Initialization zTool Loader... OK
Running zTool, please wait... OK
Loading... OK
Initialization zTool... OK
Running zTool, please wait... OK
Executing... OK
Searching Ramdump interface... COM35 detected
Reading data from phone... OK
Calculating... OK
Searching server... OK
Waiting for server answer... error (1)
Server error: A new security v2 has been detected and is not currently supported.

Done with Samsung Tool PRO v.44.4 [SM-G960U,Read Codes via Server]
Seems like this phone was before on newer firwware. Security v2 not supported.
On site supported G960USQU9AUA1, G960USQU9FUB5
...