[Android Q&A, Help & Troubleshooting] mparus:
you can try check and find file modem from linux, maybe looks like this: (example from huawei g7)

file MODEM.img

MODEM.img: DOS/MBR boot sector, code offset 0x3c+2, OEM-ID "MSDOS5.0", sectors/cluster 32, root entries 512, Media descriptor 0xf8, sectors/FAT 25, sectors/track 63, heads 255, sectors 196608 (volumes > 32 MB) , serial number 0xbc614e, unlabeled, FAT (16 bit)

you can also mount this file:

mount -t vfat MODEM.img -o loop example_folder_mount

it contains files like this:

drwxr-xr-x 2 root root 16384 Jul 5 2011 image

example_folder_mount/image:

total 47072

drwxr-xr-x 2 root root 16384 Jul 5 2011 .

drwxr-xr-x 3 root root 16384 Jan 1 1970 ..

-rwxr-xr-x 1 root root 180 Nov 2 21:44 cmnlib.b00

-rwxr-xr-x 1 root root 6568 Nov 2 21:44 cmnlib.b01

-rwxr-xr-x 1 root root 110020 Nov 2 21:44 cmnlib.b02

-rwxr-xr-x 1 root root 4456 Nov 2 21:44 cmnlib.b03

-rwxr-xr-x 1 root root 6748 Nov 2 21:44 cmnlib.mdt

-rwxr-xr-x 1 root root 180 Nov 2 21:44 isdbtmm.b00

-rwxr-xr-x 1 root root 6568 Nov 2 21:44 isdbtmm.b01

-rwxr-xr-x 1 root root 39596 Nov 2 21:44 isdbtmm.b02

-rwxr-xr-x 1 root root 112 Nov 2 21:44 isdbtmm.b03

-rwxr-xr-x 1 root root 6748 Nov 2 21:44 isdbtmm.mdt

-rwxr-xr-x 1 root root 180 Nov 2 21:44 keymaste.b00

-rwxr-xr-x 1 root root 6568 Nov 2 21:44 keymaste.b01

-rwxr-xr-x 1 root root 17816 Nov 2 21:44 keymaste.b02

-rwxr-xr-x 1 root root 208 Nov 2 21:44 keymaste.b03

-rwxr-xr-x 1 root root 6748 Nov 2 21:44 keymaste.mdt

-rwxr-xr-x 1 root root 234240 Nov 2 21:37 mba.mbn

-rwxr-xr-x 1 root root 916 Nov 2 21:44 modem.b00

-rwxr-xr-x 1 root root 7304 Nov 2 21:44 modem.b01

-rwxr-xr-x 1 root root 4212 Nov 2 21:44 modem.b02

-rwxr-xr-x 1 root root 5376 Nov 2 21:44 modem.b03

-rwxr-xr-x 1 root root 139616 Nov 2 21:44 modem.b04

-rwxr-xr-x 1 root root 81920 Nov 2 21:44 modem.b05

-rwxr-xr-x 1 root root 172096 Nov 2 21:44 modem.b08

-rwxr-xr-x 1 root root 48704 Nov 2 21:44 modem.b10

-rwxr-xr-x 1 root root 46424 Nov 2 21:44 modem.b11

-rwxr-xr-x 1 root root 99524 Nov 2 21:44 modem.b13

-rwxr-xr-x 1 root root 115348 Nov 2 21:44 modem.b14

-rwxr-xr-x 1 root root 1660568 Nov 2 21:44 modem.b15

-rwxr-xr-x 1 root root 19436496 Nov 2 21:44 modem.b16

-rwxr-xr-x 1 root root 663520 Nov 2 21:44 modem.b17

-rwxr-xr-x 1 root root 7671376 Nov 2 21:44 modem.b18

-rwxr-xr-x 1 root root 3503784 Nov 2 21:44 modem.b19

-rwxr-xr-x 1 root root 76216 Nov 2 21:44 modem.b22

-rwxr-xr-x 1 root root 502429 Nov 2 21:44 modem.b23

-rwxr-xr-x 1 root root 8063672 Nov 2 21:44 modem.b24

-rwxr-xr-x 1 root root 385684 Nov 2 21:44 modem.b25

-rwxr-xr-x 1 root root 8220 Nov 2 21:44 modem.mdt

-rwxr-xr-x 1 root root 180 Nov 2 21:44 playread.b00

-rwxr-xr-x 1 root root 6568 Nov 2 21:44 playread.b01

-rwxr-xr-x 1 root root 121664 Nov 2 21:44 playread.b02

-rwxr-xr-x 1 root root 416 Nov 2 21:44 playread.b03

-rwxr-xr-x 1 root root 6748 Nov 2 21:44 playread.mdt

-rwxr-xr-x 1 root root 436 Nov 2 21:44 wcnss.b00

-rwxr-xr-x 1 root root 6824 Nov 2 21:44 wcnss.b01

-rwxr-xr-x 1 root root 13052 Nov 2 21:44 wcnss.b02

-rwxr-xr-x 1 root root 61440 Nov 2 21:44 wcnss.b04

-rwxr-xr-x 1 root root 3375740 Nov 2 21:44 wcnss.b06

-rwxr-xr-x 1 root root 52 Nov 2 21:44 wcnss.b09

-rwxr-xr-x 1 root root 655360 Nov 2 21:44 wcnss.b10

-rwxr-xr-x 1 root root 39864 Nov 2 21:44 wcnss.b11

-rwxr-xr-x 1 root root 7260 Nov 2 21:44 wcnss.mdt

-rwxr-xr-x 1 root root 180 Nov 2 21:44 widevine.b00

-rwxr-xr-x 1 root root 6568 Nov 2 21:44 widevine.b01

-rwxr-xr-x 1 root root 134420 Nov 2 21:44 widevine.b02

-rwxr-xr-x 1 root root 780 Nov 2 21:44 widevine.b03

-rwxr-xr-x 1 root root 6748 Nov 2 21:44 widevine.mdt