Sorry didn't come back yesterday, but I'll be online a bit later...
In the meantime, flash the ROM I sent you, and use http://rumrunner.us/ to get s-off
to get the rom to your phone, go to custom recovery (CWM or TWRP), then use one of the following methods:
1- OTG cable
2- adb push <name of rom>.zip /data/media/0/
3- adb sideload <name of rom>.zip
example of adb push:
C:\ADB2>adb push Guru_Reset_M7_3.62.401.1.zip /data/media/0/ 2922 KB/s (1102709591 bytes in 368.450s)
and finally choose "install" in CWM or TWRP and install it.
then use rumrunner; remember reading the rumrunner instruction (especially the firewall/antivirus etc).
Thanks for your help though !