RC7611 firmware corruption issues

IoT Modules
1

Four of our RC7611 modems have stopped working. They will no longer power on, they do not enumerate over USB. These units have only been used for 4-8 weeks. We tried booting into emergency mode and running firmware recovery, but that failed. It is our assumption the firmware on modules have become permanently corrupted.

How likely is this due to EFS crash due to sudden power loss? Or a different issue? Is there any way to recover the modules?

I saw in RC7611 firmware release 10.0 there is a new command AT+WESHDOWN for emergency shutdown. However, I just took some measurements, it takes about 500ms from when the AT command is sent to when VGPIO starts falling. Modem modules from other vendors have much faster <50ms fast shutdown.

Can you please advise? Is there any feature for faster shutdown?

2

how about power it up overnight?
I remember i saw one EM module before like this, but eventually if I put it power one overnight, it will recover.
You can try and if you have any luck on this.

3

I was reading this today. Question for you - do you see any USB ports enumerate at all? Asking, there should be at least one USB port enumerate at some point when the module receives power. New question - what is the host OS.

4

I kept it powered on for 24 hours but unfortunately it did not recover itself.

The USB ports do not enumerate - even briefly. All I see is a USB enumeration error in the Kernel log. Host OS is Ubuntu 24.04 LTS.

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5

Have you triggered the tp1 boot pin for download mode?