Error repairing imei Lg d681

Welcome to Octoplus/Octopus Box LG Software version 2.8.9
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Checking data...OK
Platform: LG MTK
Selected port: COM504
Selected baudrate: 115200
Selected model: D681
Selected USB connection type
Please, reconnect battery and connect cable...OK
Phone found at port COM501
Phone found.
CPU name: MT6575
CPU revision: 8B00.CB00.E201.0000
Setting power state...OK
Prepairing loader...OK
Sending loader...OK
Synchronizing with loader...
Loader version: 3.2.132
Detecting flash chip...OK
Detecting EMMC flash chip...OK
Reading info...OK
Checking security...
Checking security passed!
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IMEI: Bad
Bluetooth address: 48:59:29:35:C5:88
Wi-Fi MAC address: 48:49:29:33:32:68
EMMC rpmb size: 4 Mb
EMMC boot1 size: 4 Mb
EMMC boot2 size: 4 Mb
EMMC gp1 size: 0 Mb
EMMC gp2 size: 0 Mb
EMMC gp3 size: 0 Mb
EMMC gp4 size: 0 Mb
EMMC user area size: 7456 Mb
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Fixing IMEI A...
New IMEI A: 354130-07-495623-3
Reading security area...OK
Backup saved to "D681_354130074956233_14-06-2019_21-56-07.EEP"
Patching security...Failed!
Performed by 2.8.9 Software version.


Hello, I'm having this error when trying to repair imei, what can I do?