Fried eMMC?

[matega]

There are some good news and some bad news. I've found the eMMC reader (and another one is on its way to me from the store along with a spare 16G module). The reader and the module both work, and despite my attempt to zero the eMMC out from the PBP in the beginning, its contents seemed intact (had a partition table on it and a hex editor showed content on it in the first kB). I tried flashing the default Debian image onto it, but the PBP doesn't boot from it (goes into maskrom mode) nor does it acknowledge it in any way.

I've tried going into Maskrom mode without anything installed, the output is the same.

Sadly it seems to me that either

• there is something wrong with the eMMC module in a way that the USB adapter can see it but the PBP can't, or
  
• something in my PBP is broken, either in hardware or software(?)
  
  

Does the PBP contain modifiable code that is used in booting from the eMMC?