LG K550 Stylo 2 IMEI null baseband unknown

I am trying to repair the IMEI on this LG K550 Stylo 2 from T-Mobile but
he say that imei repaired but the same problem imei stay null
baseband unknown
Welcome to Octoplus/Octopus Box LG Software version 2.8.4
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Checking data...OK
Platform: LG Qualcomm
Selected port: COM10
Selected model: K550
Reading info...
Model ID: LG-K550
IMEI: 358378-06-112869-8
Android version: 6.0.1
Battery level: 42%
SW Version: K55008p
Mode: Normal
Firmware compiled date: Apr 05 2016
Firmware compiled time: 01:00:00
Firmware released date: Apr 14 2016
Firmware released time: 11:38:10
SW Version: MPSS.JO.1.2.c2.1-00008-8937_GENNS_PACK-1
IMEI: 358378-06-112869-8
SPC: 000000
Fixing IMEI...
New IMEI: 358378-06-112869-8
Reading QCN...
Send SPC...OK
Reading Mobile Property...OK
Reading Feature Mask...OK
Reading Roaming List 0...OK
Reading NV_Numbered Items...OK
Reading NV_Numbered SIM1 Items...OK
Reading NV_Numbered SIM2 Items...OK
Reading NV Items...OK
Reading EFS...OK
Reading Provisioning Items...OK
Reading QCN done!
Backup saved to "K550_358378061128698_09-06-2018_10-02-40.qcn"
Switching to Download mode...OK
Initializing flash...OK
Reading partitions...OK
Detecting writing method...OK
Reading security area...OK
Backup saved to "K550_358378061128698_09-06-2018_10-05-26.SEC"
Writing security area...OK
Switching to Normal mode...
Found model LGK550AT* ÿd at port COM10
Send SPC...OK
Writing QCN...
Writing NV_Numbered Items...OK
Writing NV_Numbered SIM1 Items...OK
Writing NV_Numbered SIM2 Items...OK
Writing QCN done!
IMEI successfully fixed!
Rebooting phone...
Performed by 2.8.4 Software version.
--------------------------------------------------------------------------------
Platform: LG Qualcomm
Selected port: COM10
Selected model: K550
Reading info...
Model ID: LG-K550
IMEI: 358378-06-112869-8
Android version: 6.0.1
Battery level: 46%
SW Version: K55008p
Mode: Normal
Firmware compiled date: Apr 05 2016
Firmware compiled time: 01:00:00
Firmware released date: Apr 14 2016
Firmware released time: 11:38:10
SW Version: MPSS.JO.1.2.c2.1-00008-8937_GENNS_PACK-1
IMEI: 358378-06-112869-8
SPC: 000000
Performed by 2.8.4 Software version.
--------------------------------------------------------------------------------
Checking data...OK
Platform: LG Qualcomm
Selected port: COM10
Selected model: K550
Reading info...
Model ID: LG-K550
IMEI: 358378-06-112869-8
Android version: 6.0.1
Battery level: 46%
SW Version: K55008p
Mode: Normal
Firmware compiled date: Apr 05 2016
Firmware compiled time: 01:00:00
Firmware released date: Apr 14 2016
Firmware released time: 11:38:10
SW Version: MPSS.JO.1.2.c2.1-00008-8937_GENNS_PACK-1
IMEI: 358378-06-112869-8
SPC: 000000
Selecting input file...OK
Source file: "K550_358378061128698_07-06-2018_18-44-53.qcn"
Do You want to write IMEI from QCN file
or to leave current IMEI?
Write IMEI from QCN file!
Send SPC...OK
Writing QCN...
Writing EFS...OK
Writing NV_Numbered Items...OK
Writing NV_Numbered SIM1 Items...OK
Writing NV_Numbered SIM2 Items...OK
Writing Provisioning Items...OK
Writing QCN done!
Performed by 2.8.4 Software version.