No sim signal/imei after flashing custom kernel

[love150]

Hello.
I have issues with pubg being so slow on my Samsung galaxy s7 exynos.
So i installed an app to monitor gpu and discovered it was only staying at 260mhz when gaming.
I installes custom kernel tgp kernel to oc the gpu. After flashing it everything else works fine.
But just that i have no signal nor imei.
I tried different kernels too but the same.
please im in need of help.
How can i fix the signal issue.
My device: s7 g930s
But its unlocked and I'm in nigeria not korea