The LTE_BAND_MASK is the hard part, the rest is likely...
AT+ZNBANDLOCK=1,0,<lte_band_mask>
you can likely leave the last part blank or just add a ",0" at the end.
You can try the band mask for Quectel, Sierra, or Telit. The AT command manuals have them. We also have few spreadsheets on them ...
