EM7565 Stuck in Boot and Hold Mode After Update – Permanent Issue

[jyijyi]

does this help?

EM7565 stuck in some sort of update mode

I have an EM7565 under linux and somehow during our manufacturing process it is now stuck booting with a usb ID like lsusb Bus 001 Device 004: ID 1199:9090 Sierra Wireless, Inc. where it should be Bus 001 Device 002: ID 1199:9091 Sierra Wireless, Inc. fwdwl-litehostx86_64 can no longer run an update and the ttyUSB0 does not respond to AT commands . How do I recover a modem in this state?