G935U - G935A READ CODE ISSUES, DIFFERENT PCs, FACTORY RESET, Z3X RESPONSE ERROR (1)

[ 7/15/2018 4:31:43 PM ] Operation: Read Codes via Server
[ 7/15/2018 4:31:43 PM ] Selected model: SM-G935U
[ 7/15/2018 4:31:44 PM ] Software version: 33.2
[ 7/15/2018 4:31:44 PM ]
[ 7/15/2018 4:31:44 PM ] Checking Login and Password... OK
[ 7/15/2018 4:31:47 PM ] Ballance: XX crd.
[ 7/15/2018 4:31:50 PM ] You have XX credit(s) left. This operation takes 5 credits.Continue? Yes
[ 7/15/2018 4:31:55 PM ] Waiting ADB device... OK
[ 7/15/2018 4:31:59 PM ] Reading phone info...
[ 7/15/2018 4:31:59 PM ] Model: SM-G935U
[ 7/15/2018 4:32:00 PM ] Android version: 7.0
[ 7/15/2018 4:32:00 PM ] PDA version: G935UUEU4BRD1
[ 7/15/2018 4:32:01 PM ] CSC version: G935UOYM4BRD1
[ 7/15/2018 4:32:01 PM ] Phone version: G935UUEU4BRD1
[ 7/15/2018 4:32:02 PM ] Product code: SM2G935AZKAATT
[ 7/15/2018 4:32:03 PM ] CSC country code: USA
[ 7/15/2018 4:32:03 PM ] CSC sales code: ATT
[ 7/15/2018 4:32:04 PM ] Phone SN: RF8H90GNABZ
[ 7/15/2018 4:32:05 PM ] IMEI: 352329080******
[ 7/15/2018 4:32:05 PM ] HW version: REV0.7
[ 7/15/2018 4:32:06 PM ] RF cal date: 2016.09.06
[ 7/15/2018 4:32:06 PM ] Chip name: MSM8996
[ 7/15/2018 4:32:07 PM ] Modem board: MSM8996
[ 7/15/2018 4:32:08 PM ] Security patch: 2018-04-01
[ 7/15/2018 4:32:09 PM ] Boot Warranty bit: 0
[ 7/15/2018 4:32:16 PM ] Waiting for device to become ready... OK
[ 7/15/2018 4:32:21 PM ] Initialization zTool... OK
[ 7/15/2018 4:32:24 PM ] Running zTool, please wait...
[ 7/15/2018 4:32:24 PM ] Start... OK
[ 7/15/2018 4:32:34 PM ] Initialization... OK
[ 7/15/2018 4:32:36 PM ] Generate and check client proof... OK
[ 7/15/2018 4:32:37 PM ] Verify proof by client... OK
[ 7/15/2018 4:32:38 PM ] Reading data from phone... OK
[ 7/15/2018 4:32:46 PM ] Searching Ramdump interface... COM7 detected
[ 7/15/2018 4:33:01 PM ] Reading data from phone... OK
[ 7/15/2018 4:33:16 PM ] Calculating... OK
[ 7/15/2018 4:33:43 PM ] Searching server... OK
[ 7/15/2018 4:35:01 PM ] Waiting for server answer... error (1)

[ 7/15/2018 4:58:40 PM ] Checking Login and Password... OK
[ 7/15/2018 4:58:42 PM ] Ballance: xx crd.
[ 7/15/2018 5:00:22 PM ] You have xx credit(s) left. This operation takes 5 credits.Continue? Yes
[ 7/15/2018 5:00:26 PM ] Waiting ADB device... OK
[ 7/15/2018 5:00:30 PM ] Reading phone info...
[ 7/15/2018 5:00:31 PM ] Model: SM-G935U
[ 7/15/2018 5:00:32 PM ] Android version: 7.0
[ 7/15/2018 5:00:32 PM ] PDA version: G935UUEU4BRD1
[ 7/15/2018 5:00:33 PM ] CSC version: G935UOYM4BRD1
[ 7/15/2018 5:00:33 PM ] Phone version: G935UUEU4BRD1
[ 7/15/2018 5:00:34 PM ] Product code: SM2G935AZKAATT
[ 7/15/2018 5:00:34 PM ] CSC country code: USA
[ 7/15/2018 5:00:35 PM ] CSC sales code: ATT
[ 7/15/2018 5:00:35 PM ] Phone SN: RF8H90GNABZ
[ 7/15/2018 5:00:36 PM ] IMEI: 352329080******
[ 7/15/2018 5:00:36 PM ] HW version: REV0.7
[ 7/15/2018 5:00:37 PM ] RF cal date: 2016.09.06
[ 7/15/2018 5:00:38 PM ] Chip name: MSM8996
[ 7/15/2018 5:00:38 PM ] Modem board: MSM8996
[ 7/15/2018 5:00:39 PM ] Security patch: 2018-04-01
[ 7/15/2018 5:00:39 PM ] Boot Warranty bit: 0
[ 7/15/2018 5:00:46 PM ] Rebooting phone... OK
[ 7/15/2018 5:00:51 PM ] Waiting ADB device... OK
[ 7/15/2018 5:01:39 PM ] Rebooting phone... OK
[ 7/15/2018 5:01:45 PM ] Waiting ADB device... OK
[ 7/15/2018 5:02:34 PM ] Waiting for device to become ready... OK
[ 7/15/2018 5:02:37 PM ] Initialization zTool... OK
[ 7/15/2018 5:02:40 PM ] Running zTool, please wait...
[ 7/15/2018 5:02:40 PM ] Start... OK
[ 7/15/2018 5:02:57 PM ] Initialization... OK
[ 7/15/2018 5:03:00 PM ] Generate and check client proof... OK
[ 7/15/2018 5:03:01 PM ] Verify proof by client... OK
[ 7/15/2018 5:03:01 PM ] Reading data from phone... OK
[ 7/15/2018 5:03:09 PM ] Searching Ramdump interface... COM7 detected
[ 7/15/2018 5:03:25 PM ] Reading data from phone... OK
[ 7/15/2018 5:03:40 PM ] Calculating... OK
[ 7/15/2018 5:04:06 PM ] Searching server... OK
[ 7/15/2018 5:05:25 PM ] Waiting for server answer... error (1)
[ 7/15/2018 5:05:29 PM ]

Please advice, already tried factory reset.

Should restore back to g935a fw or one from 2017?