A520S can't repair IMEI

Hello, octoplus team.
pease help repair IMEI :

Welcome to Octoplus Box Samsung software version 2.7.9.6
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Platform: Samsung Android
Selected port: COM5
Selected model: SM-A520S
Operation: Repair IMEI A
Please, press "OK" button on the phone to allow USB debugging.
Please, press "OK" button on the phone to allow USB debugging.
Detected phone model: SM-A520S
Firmware compiled date: Thu Apr 19 09:22:41 KST 2018
PDA version: A520SKSU2CRD7
CSC version: A520SSKC2CRD7
SW version: A520N0KOU2CRD6
Phone SN: 00000000000
Android version: 8.0.0 (R16NW)
Sales code: SKC
Country: KOREA
HW platform: exynos5
HW Chip: exynos7880
HW Modem: SHANNON325
Security patch level: 2018-04-01
Warranty Void: 1
SIM 1 status: absent
Codename: a5y17lteskt
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Connecting to server ..
Username: shuric
Connect to server successfull.
Checking smart card...
Smart card successfully checked.
Your balance: 100 credits.
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Checking operation...failed
Device's modem is not supported. Please update phone's firmware!
Write IMEI failed
Performed by 2.7.9.6 Software version.

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