moto g5s plus xt1805 lost imei

I am a tinkerer and I have been playing around with my Moto G5s Plus XT1805 software. After flashing a custom ROM, I have lost my IMEI, therefore I cannot connect to any network. I have tried reverting to factory firmware many times, but the same result. I know I have voided my warranty by unlocking my bootloader, but I do hope the IMEI can still be written somehow. Can anybody help me?