No lte data Mi 11 Ultra Chinese Rom 12.5.20

[Dubbss]

Hello all so I bought the Mi 11 ultra from Giztop Chinese rom 12.5.20 currently I think this issue started after the last update but I'm not sure. so my LTE/5G disconnects often
it's wired when I have no data you can see the data arrows but the Icon is missing or there is just an X. to get data I have to reboot the phone to data back. I have factory reset still have the same issue. I guess I have to unlock and install Global rom and thoughts I all so tried a few different APN settings

thanks