Accidentally chose some other radio band!!!

I was trying to force 3G in my OP2 and used *#*#4636#*#* to enter testing menu.
Under that menu, I accidentally selected some other radio band and now one sim( SIM 2) is disabled(unable to find network).

I tried resetting phone to factory setting, but it didn't helped.
Also updated to latest OxygenOS 2.2.1, still one sim is disabled.

Please help....
thaaaanks :)

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