Switch modem to ACM-only mode. AT^U2DIAG=0
http://rus-linux.net/nlib.php?name=/MyLDP/internet/modem-ru.html

On 14 сен, 00:07, Roman Mamedov <r...@romanrm.ru> wrote:
> Hello!
>
> If my Yeeloong is powered on with an USB 3G Modem (Huawei E1550) plugged in, 
> it will lock up at the PMON's screen with the graphical logo, the boot won't 
> proceed, and Tab or Del keys won't work. But if the same 3G modem is plugged 
> in after Yeeloong is fully booted, it works fine.
>
> I think this might be because the 3G modem (by default) emulates an USB 
> CD-ROM and also a card reader, which may confuse PMON, e.g. when it tries to 
> locate boot.cfg.
>
> Is there any way to fix this? Thanks.
>
> --
> With respect,
> Roman
>
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