Possible build MiWifi Mini with support Qualcomm MDM 9225?

i have local made router with this spec hardware

SoC = MT7620N + MT7612EN (openwrt= MiWifi)
ROM = 16Mb
RAM = 64Mb
LTE Module = Qualcomm MDM 9225 (openwrt=D-Link DWR-921 Rev. 3C) 
IC RF = wtr1625l

previously i build fw based miwifi firmware and work with a bit problem (change mac few times), but i think its normally because isn't officilal or maybe im stupid
and i want to use mPCIe Module for mwan. i was try build D-Link dwr-921 Rev C3 but isn't support MT7612EN and very unstable. so... i think i want to build miwifi with mpcie module.
any suggestion package i must include in config? bescause im noob here

thank you

I'm looking for this also, here some info from original ROM

# cat /proc/mtd
dev:    size   erasesize  name
mtd0: 01000000 00010000 "ALL"
mtd1: 00030000 00010000 "Bootloader"
mtd2: 00010000 00010000 "Config"
mtd3: 00010000 00010000 "Factory"
mtd4: 009b0000 00010000 "Kernel"
mtd5: 005f0000 00010000 "Kernel2"
mtd6: 00010000 00010000 "SmsInfo"

# lspci
00:00.0 Class 0604: Device 1814:0801 (rev 01)
01:00.0 Class 0280: Device 14c3:7662

# ls /dev | grep usbdev | awk 'END { print }'
# cat /sys/class/usb_device/usbdev1.2/device/idVendor
# cat /sys/class/usb_device/usbdev1.2/device/idProduct

binwalk mtd0_ALL
* suggest: you'd better to input the parameters enclosed in double quotes.
* made by geekxuexiba

76288         0x12A00         U-Boot version string, "U-Boot 1.1.3 (Feb  1 2016 - 14:05:57)"
204155        0x31D7B         Unix path: /etc/init.d/cwmpd restart
210154        0x334EA         Linux kernel version 2.6.36
327744        0x50040         LZMA compressed data, properties: 0x5D, dictionary size: 33554432 bytes, uncompressed size: 10722984 bytes
16719227      0xFF1D7B        Unix path: /etc/init.d/cwmpd restart
16725226      0xFF34EA        Linux kernel version 2.6.36