n915a unlock done but now one problem help

REPAIR INSTRUCTIONS:
Try different algorithm types if you got errors during procedures
(Old and New securities)

Activate Diagnostic Port:
1. Tap 7 times on ‘Build number’ in ‘Settings’-‘About phone’ to enable ‘Developer options’,
go to ‘Settings’-‘Developer options’ and enable ‘USB debugging’.
3. Select device in ADB settings.
2. Press ‘Activate Diag’ button.

Reset EFS, Disable Factory Mode:
Phone must be rooted!
If the software can’t root the phone automatically,
then you must root your device manually.
1. Power on the phone.
2. Tap 7 times on ‘Build number’ in ‘Settings’-‘About phone’ to enable ‘Developer options’,
go to ‘Settings’-‘Developer options’ and enable ‘USB debugging’.
3. Connect the phone to PC with USB cable, install drivers if needed.
4. Select device in ADB settings.
5. Press ‘Reset EFS’ if you need to reset it.
Be carefully, do not perform this without necessity. Backup will be created automatically.
6. If you have yellow table on your device screen, then press ‘Disable Factory Mode’ button.

Wipe EFS/NVM:
If you have ‘IMEI null/null’ or ‘Phone baseband unknown’ errors,
Then you can try to repair this errors with this function.
Phone must be rooted!
If the software can’t root the phone automatically,
then you must root your device manually.
1. Power on the phone.
2. Tap 7 times on ‘Build number’ in ‘Settings’-‘About phone’ to enable ‘Developer options’,
go to ‘Settings’-‘Developer options’ and enable ‘USB debugging’.
3. To use ‘Auto backup/restore QCN’ function (recommended):
Type *#0808# and select ‘DM+MODEM+ADB’.
Type *#9090# and select ‘DM/DUN over HSIC’.
Or use ‘Activate Diag’ function.
Or you can disable this function and use ADB only.
4. Connect the phone to PC with USB cable, install drivers if needed.
5. Select diagnostic port in port settings if ‘Auto backup/restore QCN’ is not skipped.
6. Select device in ADB settings.
7. Press ‘Wipe EFS/NVM’ button.
Operation: Unlock
Selected model: SM-N915A
Selected port: COM155 SAMSUNG Mobile USB Serial Port
Software version: 23.9

Reading phone info…
Reading IMEI… OK
IMEI: 012549301638237
Unlocking… OK
Reseting… OK
Unlock done

Done with Samsung Tool PRO v.23.9

it was working well here customer was using it

after 2-3 days its suddenly showing emergency call

i think imei is blacklisted can anyone help me with certi file for n915 plz