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danielewood / sierra-wireless-modems

EM7565/EM7455/MC7455 - Modem Configuration
The Unlicense
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Successful flash of EM7455, no power light after #75

Open ghost opened 3 years ago

ghost commented 3 years ago

I have an EM7455 and am using an external enclosure with a bright blue power light. Prior to flashing the power light would come on after a bit.

After flashing successfully, the power light only flashes briefly after USB is plugged in and then there is no light after that.

Any ideas?

danielewood commented 3 years ago

Sounds like the modem is in/stuck in boothold mode.

What does lsusb show?

ghost commented 3 years ago

lsusb shows

Bus 002 Device 003: ID 0781:5597 SanDisk Corp. 
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 008 Device 002: ID 1058:25fb Western Digital Technologies, Inc. easystore 25FB
Bus 008 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 007 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 006 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 005: ID 04d9:0169 Holtek Semiconductor, Inc. 
Bus 001 Device 004: ID 046d:c52b Logitech, Inc. Unifying Receiver
Bus 001 Device 003: ID 05e3:0608 Genesys Logic, Inc. Hub
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

running the script again shows the following in loop

Could not find any EM7455/MC7455 USB modems
Unplug and reinsert the EM7455/MC7455 USB connector...

The USB port on the computer and USB cable are the same ones that were used when flashing with the script. It's housed in this NGFF to USB enclosure: image

danielewood commented 3 years ago

Pretty sure it's dead.

Run dmesg -c to clear the history. then re-plug the modem. Wait 30 seconds, and run dmesg

If nothing shows up, the modem is definitely dead. It happens. I had a Em7565 just randomly die on me after a month, which was annoying since it was from China and $200 at the time.

I also had a 7455 die after six months and fry the RBM11G it was in.

xikamo commented 1 year ago

Use SED (Smart Error Detection) to solve this issue. Module tracks consecutive resets occuring soon after power-on. After a sixth consecutive reset, the module waits in boot-and-hold mode for a firmware download to resolve the power-cycle problem.