sm-g965u t mobile app lock via server failed what is the solution

Question

Operation: Unlock AppLock (TMB/ATT) via Server
Selected model: SM-G965U
Software version: 43.27

Checking Login and Password... OK
Balance: 15 crd.
You have 15 credit(s) left. This operation takes 6 credits. Continue?  Yes
Waiting ADB device... OK
Reading phone info...
Model: SM-G965U
Android version: 10
PDA version: G965USQS9FUG2
CSC version: G965UOYN9FUG2
Phone version: G965USQS9FUG2
Product code: SM2G965UZKATMB
CSC country code: USA
CSC sales code: TMB
Carrier ID: TMB
Phone SN: RF8KB00KAEJ
IMEI: 358215090733678
HW version: REV1.1
RF cal date: 2019.05.29
Chip name: SDM845
Modem board: SDM845
Security patch: 2021-08-01
Boot Warranty bit: 0
SIM State: LOADED
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 COM14
Reading IMEI... OK
Initialization zTool Loader... OK
Running zTool, please wait... OK
Loading... OK
Initialization zTool... OK
Running zTool, please wait... OK
Reading data from phone... error (5)
AP version G965USQS9FUG2 is not supported, downgrade if possible

Done with Samsung Tool PRO v.43.27 [SM-G965U,Unlock AppLock (TMB/ATT) via Server]

Answer 1

Hello. Flash this firmware and repeat operation.

https://samfw.com/firmware/SM-G965U/CCT/G965USQS9FUA1

Answer 2

The "App lock via server failed" error on the SM-G965U (Samsung Galaxy S9) can occur due to server communication issues. Here's how to resolve it:

1. Check Network Connection: Ensure you have a stable internet connection for the server to respond.
2. Restart Device: A reboot can often clear temporary glitches.
3. Contact Support: If the issue persists, reach out to T-Mobile support for assistance.

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Answer 3

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Answer 4

How can I downgrade the AP version or is there any other solution to fix this error?

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