Nova 3i INE-LX1 IMEI Repair and FRP with Sigma
 

Dear Sigma Team Plz add this Model Nova 3i INE-LX imei repair

It is possible, but you will need to downgrade your smartphone to earlier firmware version.
Read about Huawei firmware / Android downgrade:
https://sigmakey.com/en/supportedfea...?phone_id=2634

Android Adapter PCUI (COM756), Provider: HUAWEI Technologies CO.,LTD, Driver ver.: 1.0.26.0, Date: 5/18/2016, USB\Vid_12D1&Subclass_13&Prot_22
Firmware: System 8.2.0.099(009H), Date: Wed Dec 12 21:37:14 CST 2018
Boot Version: System 8.2.0.099(009H)_BOOT, FastBoot Version: Chipset-miamiC208.2.0.001(01V4)_FASTBOOT
Recovery Version: (unknow), System Version: System 8.2.0.099(009H)
Removing firmware protection...This Android security patch level is not supported.
Please wait for future updates.

Android Adapter PCUI (COM756), Provider: HUAWEI Technologies CO.,LTD, Driver ver.: 1.0.26.0, Date: 5/18/2016, USB\Vid_12D1&Subclass_13&Prot_22
Firmware: System 8.2.0.099(009H), Date: Wed Dec 12 21:37:14 CST 2018
Boot Version: System 8.2.0.099(009H)_BOOT, FastBoot Version: Chipset-miamiC208.2.0.001(01V4)_FASTBOOT
Recovery Version: (unknow), System Version: System 8.2.0.099(009H)
Removing firmware protection...This Android security patch level is not supported.
Please wait for future updates.

nonsense kirin 710 repair imei only by cert file

can you please explain how to do this?

Here is the manual for you:
Restore IMEI: Read/Write Huawei certificates (secure data)