@Yannie : Thank you for your reply! I see, the chip being different from V3 (and probbaly from V1 as well I guess) helps sort this out. Have a great day!

Our company has three of these swicthes: T1600G-28TS 2.0 (aka TL-SG2424), Hardware Verson 2.0 (Emphasizing the HW version as it appears to be quite important in this case.) Nowadays modern browsers...