I guess some might find this useful:
To make the long story short - I was setting up my router with OpenWrt to share the internet, and connected the wrong power supply unit that provided 7.5 instead of 5 volts. The router is ok – there’s a good stepdown converter onboard, while the usb host is directly powered by what comes from power supply. So, that’s 2.5 volts overvoltage.
The modem got totally screwed: Blink and it’s dead. So I took the screwdriver and disassembled it and found a way to fix.
Here goes the full text with photos: http://necromant.ath.cx/wp/2011/03/14/a ... dpa-modem/