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Posts: 1,102 | Thanked: 1,687 times | Joined on Jan 2011 @ Touring
I think if you are getting the USB symbol the USB port is good enough, though you could get a cheap hot air reflow unit and try reflowing the USB solder points, you might try putting some lead % solder paste on the pads area to improve the quality of the solder joints.
I had something similar with a Nexus tablet, after resoldering I was able to do full speed USB vs erroring out.
But the problem might also be the EMMC going bad and the bootloader stage process goes bad before it can complete a USB connection or boot. Which means too bad, I have had a few of these which never become available for flashing, especially a few tries fomr the Chinese "New"(refurbished) N900s a few years back.

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