GSA-4163b for reseller Lenovo (IBM?)

[qanda]This thread is about the LG GSA-4163B. Click here to see full specs[/qanda]Hi,
I just bought a GSA-4163b on ebay and the drive doesn’t look like the normal oem’s. It says “manufactured for Lenovo” (IBM?) and the firmware is Ax13.
I’ve never seen this firmware, it might be a modified version for reseller.
Basically i want to upgrade the firmware or at least confirm it’s up to date, but i can’t find anything on lenovo site,

I don’t know if i can flash the A105 or A106 from LG either, they’re saying their firmware is not for oem drive.

Any ideas? Thanks.

Anybody flashed an OEM version of this burner for reseller like IBM or Dell?