MC7750 QDL / EDL Mode 05c6:9008 - Hard Brick ?!

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1

Hello everyone. I want to share a weird state of my MC7750. It shows up in QDL - maybe even EDL - mode as 05c6:9008. FW Download does not work with qmi-firmware-update or firmware tools in Sierra SDK. So I ended up using Streaming DLOAD Tool from openpst · GitHub.

Here I always get a response with 0x03 at the second response byte. I assume that a severe error occured.

Dumping 5 bytes written
7e 0b ab 4e 7e                                    | ~..N~
Dumping 7 bytes read
7e 03 00 06 9e 4c 7e                              | ~....L~

Does anybody have had a similar case and can help classify this error shown above?
BTW.: What you see is a HDLC dump, but I was not able to “read” it due to missing information.

2

Hi simsum,

Using an unofficial tool to flash FW to the module may cause unexpected issues. Could you please try with FDT tool on Windows?

Thanks,

3

Hi jerdung, the excerpt is not part of a flash procedure. It’s a simple NOP (NoOperation).
The official Sierra SDK was already used but with no success. The same response part 0x3 was detected by Sierra’s firmwareLite DownloadTool and qmi-firmware-update. (0x7e is HDLC header / trailer.)
The windows FDT.exe Tool cannot even recognize the already entered QDL/EDL state.

4

Hi simsum,

It seems that you did something which is out of Sierra’s scope and your device stuck in a QLOAD 9008 state. Could you follow the topic in XDA forum for the solution?

In case your device is still stuck in this state, please send it for repair
https://csm.sierrawireless.com/RepairCenter.aspx

Thanks,