UGJG9 was the initial August 2.1 release.
UGJH2 was an updated 2.1 release.
UGJK4 was the initial December 2.2 release.
UGJL2 is the current 2.2 release.
Any of these are considered stock firmwares and fine to have loaded for a return to Samsung.
Hope this helps!
Device History (bold = current
): Audiovox CDM-9000, Audiovox 8910 Flip, Samsung SPH-A920 Flip, HTC Touch/Vogue (Android 1.6), Samsung Galaxy I7500L (GAOSP
), Samsung Galaxy S I9000M (CM7
), Samsung Galaxy S II I9100M (CM10.1
), Samsung Galaxy Tab 10.1 P7510 (CM 10.1
), Samsung Galaxy S III I747M (CM10.1
), Samsung ATIV Smart PC Pro XE700T1C
(Windows 8 Pro), Samsung ATIV S T899M (Windows Phone 8), HTC One M7 UL