MIB2 firmware containts MMX2\app\70\default\app.img file which containts QNX6 filesystem1 that can be mounted in Ubuntu with
sudo mount -o loop -t qnx6 ~/MHI2_ER_AUG22_K3346_MU1438/app.img ~/app
For manipulating ifs files we need dumpifs and exMifsLzo (as main.stage2.ifs.lzo is LZO compressed)
git clone https://github.com/FrancisHoogendijk/dumpifs
Footnotes
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app.img also contains imagefs section ↩