SL6087 blocked in bootloader mode

Legacy Open AT
1

Hi to all!
We have some SL6087 modems with s/n: BE130… On all of them there are following problem:

  1. Modem recognized as Sierra Wireless CDC EEM Product 1A:
    1
    and no serial ports
  2. In Developer Studio 3.6 there are COM3 device, after open it we have such responce:
    2
    2894×492 25.7 KB
  3. In Target Management it is impossible to upload bootloader or firmware:
    3
    31320×780 35.4 KB
  4. After port is opened, low cmd is supported:

----------------- Port opened -----------------
AT
OK
AT+WMSN
ERROR
AT+CFUN=1
ERROR
at
OK
atw
OK
atw
OK
wat+wdwl?
ERROR
at+wdwl?
ERROR
ati9
United States

OK
ati3
LSI Softmodem Version 2.2.89.2

OK
ati6
OK
ati5
2.2.89.2, HDA MB, HDA, A35 S-Rev:2 L-Rev:3, 19

OK

  1. DwlWin also cant work because at+wdwl gives error.

Is it possible to recover modem and use it as open at device?

2

Dwlwin is not using +wdwl, it is using boot pin to trigger the download mode

3

boot pin must be connected to 1.8v and after that with dwlwin it is possible to overwrite bootloader?

4

Have you tried with dwlwin?

5

Have you resolved it?

6

not yet. there are some problems to change boot pin state. i will try at this week and write result here. thanks!