Help! No Cellular Service After Flashing China ROM on Redmi Note 13 Pro 5G – Stuck with Locked Bootloader! (iPod Bricked?!)

I recently bought a Redmi Note 13 Pro 5G smartphone (global version with a locked bootloader) Garnet. I used the rename trick to update from the global ROM to the China ROM, as I heard the China ROM offers more features. After successfully updating, I noticed that I no longer have cellular service, though Wi-Fi still works.

I've read that software updates shouldn't affect hardware bands, so I'm confused as to why my phone has essentially turned into an iPod. Any insights would be...

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