Is there a service manual that shows how to open up the Lumia 800?
The built-in card readers I've seen so far were all PCI-Express, appearing in Device Manager as an SD/MMC host controller.
But even with a USB reader, it should be possible to interop unlock, or maybe even root the device, as the main OS partition (including the registry) should be accessible.
EDIT: The test-point cables are only good for ATF or the testpoint shorting hack, as they don't connect the VCC and VCCQ lines. (ATF operates on a powered-ON PCB, and overrides the logic levels sent by the main CPU, rather than operating with a powered-down PCB with the CPU inactive.)
Actually, the eMMC chip documentation shows that it fully supports 1-bit MMC (not SDIO, and not SPI) mode, and only switches to a higher bus width when explicitly requested to do so.
EDIT: Not very relevant, but open the Lumia 710 boot loader MBN in a hex editor, and go to address 0x1E490 for a good laugh. Or, if you have the Lumia 800 Qualcomm boot loader image, it's @ 0x1E52C.
I'd suggest renaming on of the colors. Would be great if it was possible to interop the phone without losing data.
Ok L710 fully unlocked
Those 2 parts are wrong. I used to narod.ru
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http://www.youtube.com/watch?v=-rQbFp7yasc