Mobile network does not work after flashing a custom ROM on Samsung Galaxy J7

I've flashed Lineage OS 18.1, 17.1, and Havoc OS to Samsung Galaxy J7, but it seems that every custom ROM I flash on my mobile changes my IMEI to 350000000000006, thus my mobile network doesn't work. WiFi still works properly. I've tried: - Formatting the device with TWRP first, instead of just wiping. - Installing the recovery of the Lineage OS 18.1 itself and making things by it. - The MTK tool to repair my IMEI, but my mobile is not MediaTek-based, so it doesn't work. - A bunch of apps that promise to repair your IMEI, but no success. - Fastboot, but it seems that this mobile does not support it. Specs: - My mobile: SM-J700M - Brand: Samsung - OS: Lineage 18.1 - Country: Brazil - Country code: 55 - Mobile service provider: TIM Any clue on how I proceed after this?