@Mehrdad @Kevin_Z 

Some developments...

I found edl; a tool for interacting with EDL (Emergency Download) mode via both Firehose and Streaming methods, though Streaming is still very buggy and in beta stage.

edl.py can communicate and interact with QDL mode too, thankfully

First I had to change the intraction method with M7350 to Firehose:

sudo python edl.py reset --loader=Loaders/qualcomm/patched/mdm9x07/prog_nand_firehose_9x07.mbn

after that I extracted GPT and generated the RawProgram XML files with:

sudo python edl.py printgpt xmls/ --genxml

You can also dump the whole thing or step by step rewrite/overwrite partitions with edl.py, check -h

Although I have now fully flashed/rewritten the recover firmware on my M7350 but it is indeed still stuck in QDL mode :( and I don't know how to exit from it or reboot. (hard reset button doesn't work too)

Any idea?