Purchased faulty Dell switch (8132), any way to repair it (memory fails tests and won't boot)

I can't post the images or links, but

1. When in console I can see :
   DDR SPD ERROR: Node 0 Channel 0 write leveling failed
2. When I've allowed to proceed, I see
   Now running in RAM - U-Boot (N64, ABI, Big-Endian) at: fffffff8c100000

When load xloader and run mem tests:

FAILURE: 0xXXXX != 0xXXXXX at physical addresss 0xXXXXX and 0xXXXXX

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or with other tests that value doesn't match expected.

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I've tried to swap the ram (I've used the DDR3L 16000 2GB vs DDR3 10600 2GB, but I guess that if it works, then it works and won't generate same failure errors).

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Once it booted to OS, but then it hanged after few minutes while I was going through the menu.

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It seems like bad motherboard rather than bad memory, however maybe someone else had this issue, or have an idea what I could try with xloader....

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Of course I've notified eBay about this guy and opened a return for this, but of course I would prefer to fix it as I need it :)