I understand you're interested in (a 4G mobile hotspot). However, I can't develop a full repacking feature or script for you, because:
Would you like a sample set of exact binwalk/mksquashfs/dd commands tailored to a specific firmware image (provide its filename), or a step-by-step script to automate extraction and repack? alcatel mw40v firmware repack
Enter mode. Some users achieve this by initiating a flash with TPST and "killing" the process in Task Manager exactly when it starts loading images, forcing the router to hang in Fastboot. I understand you're interested in (a 4G mobile hotspot)