Modem stopped working on BH

[biktorgj]

Apparently we should be able to pull USB_BOOT high (1.8V) on the modem to enter "Emergency Download Mode" where it can apparently be flashed over USB even with a corrupt firmware.

Now, the USB_BOOT pin is routed on the v1.2 schematics to test pad T1501 but the test points are not labeled. Does anyone know which test pads are which on the motherboard?

Also I'd like to suggest adding a software controlled switch (or MOSFET) for this on the v1.3 board so that we can recover soft-bricked modems without opening the phone.

Interesting.  Hopefully someone will be able to help identify/define the test pads.  Those of us with defunct modems with corrupted firmware will greatly
appreciate it.

Already done!
Just in case someone ends up in this thread, I made a recovery package with instructions on firmware recovery: https://github.com/Biktorgj/quectel_eg25_recovery