This ones a long shot - but if you have another USB cable available, try using that. Perhaps the one you are using is somewhat damaged - not enough to cause errors flashing, but enough to corrupt data? I don't know but i'd certainly give it a try! .

---------- Post added at 08:00 AM ---------- Previous post was at 07:59 AM ----------

Yeah that's the screen of bootloader saying it's all sweet to flash with rsd-lite
So that's a good sign
I'm concerned perhaps it's had some physical damage to the system storage.
I'm just confused, your steps appear to be all correct, what you've done allready, and it should have worked allready!