I think if there's enough juice the device should allow flasher to talk to the device, from there you can turn on R&D mode and force on mode when the cable is plugged in.

Thanks, but I didn't understand the last part. What is R&D mode and what is "force on mode"

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See here:
https://wiki.maemo.org/R%2526D_mode

Thanks

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I was reading at Nokia power user website and with this I didn't understand something. Doing this force, the phone would do a factory reset and I must reflash again the firmware? Another thing I've read is that appears to be that once you force the white lite of charging stays on

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I think it does not, but if you force it then the LED will stuck on.