DrAzzy:
Let's clarify - after you burned bootloader, you then connected a USB serial adapter to it, and selected the com port associated with that adapter, and then tried to upload to it? (otherwise, you're trying to upload to the Uno you were using as ISP to bootload it with).Failing that, I would be suspicious that you actually got 5v/16MHz boards instead of 3.3v/8MHz ones.
I think on the ones with the jumper desoldered, you're probably not ending up with power on the board at all for some reason - I'm not sure what exactly that jumper connects - probably the Vcc pin on the end with the 6-pin FTDI header?
Just tried to burn the 5V 16MHz bootloader with 5V->VCC, again the same error 