There are multiple ways to do it. I dit by downloading the latest OTA update from the OnePlus 9 Pro, then used payload_dumper on Linux to extract the fastboot files. Then, I mounted modem.img and searched for the mbn file for my carrier.How do I get a working mbn file for my carrier to put it on my Pixel 6 Pro?
EDIT :
Here are the files for all carriers from OnePlus 9 Pro : https://www.mediafire.com/file/p55k56p0y0hj9vj/MBN-OnePlus9Pro.zip/file
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