USB device not detected on boot

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The UMTS modem Huawei E169 sometimes is not detected as a USB device
on boot. No entry on /proc/...
When pluged after the system is booted, it is always detected.

It looks like some kind of incompability with this unit firmware(I've
tested 5 hardware pieces).

Is there any kind of diagnose suit I can run to try to diagnose the issue?

I could only find the problem on Openwrt(2.6).

Regards,
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