here you'go:Hi there! I'm out of my country right now and I've not a PC to extract the modem.img..... Could someone extract it and post here or send it to a clue service? Thanks in advance
you will find the extracted modem.img ( ~162MB) file (just renamed it to make it clear from what miui update package it is..)
you should be able to flash it via twrp (just switch to image flashing in twrp to display it..)
btw the latest china stable (miui_MIMIX2S_V10.3.1.0.PDGCNXM_fd117de242_9.0)
pps.: i'm curently download xiaomi "offical" 9.4.18 developer rom and xiaomi.eu dev rom... and will check the modem.img files.. and also will upload it to the cloud share...