Well, the PC changed the IP address associated with the supplied LAN cable to the PC with the WG602 and then log in. The menu is completely in English. The configuration proved a little troublesome, what upset unnecessarily in my case. Every now and then the box crashed for some reason, only a hardware reset might help.
Firmware Update: Can you download from the Netgear site and play via the Setup menu. Keyword Poor documentation: It has a text in the Setup Menu indicates that the firmware necessarily has to be unpacked before. The firmware was in my case the file "wg602v3_1_1_0_non_na.trx", a TRX file. There is nothing to unpack, you can play as the update easily. Only: It takes a long time until the WG602 reports again - be patient.
I run the Netgear WG602v3 as a repeater to a Fritz! Box WLAN 3030. Between Fritz! Box and WG602 can only WEP encryption are driven. There are also numerous posts on this topic in various forums. Now he performs his duties - and he does however flawlessly without any problems.
Tip: Be sure to visit forums and read opinions! Applies in particular if the WG602 is to be used as a repeater. (Ex .: IP-Phone-Forum [dot] de)
Bottom line: If it is running, then it is going well. Due to the cumbersome and partly misleading configuration and the untimely and also partially misleading documentation only 2 points, sorry. But without the help of diverse Forum posts I would also not have got done so fast. For Anfäger and lay not recommended.