I recently got a lot of Micron 5200 ECO here in Europe (around 100 EUR for the Micron 5200 ECO 1.92TB, not a Steal, but keep in mind that's with 21% or 25% VAT on top and it's therefore [much] more expensive than the US).
What Issues with Micron 5100 or 5200 Firmware are you talking about exactly ? I previously read Micron / Intel are or were the few ones that publicly publish their Firmwares on their Websites (unlike e.g. Samsung, Oracle, Toshiba [?], etc) so I probably could download it from their Website.
Or is there a Thread here about that ? I know for some Samsungs there are special Procedures (e.g. Download Firmware from Dell and trim the first XXX Bytes etc) ...