Trying to make use of a WPN802 v2 (but failing)

I'm finding that my wifi router signal (not Netgear) is not reaching the whole house. In some parts of the house I only get one bar ("poor") and in other parts I get no signal at all. The wifi transmitter is unfortunately in a corner room (and I can't change that).

So I'd like to use this WPN802 v2, that I've had sat in a box for years, to get myself more signal coverage.

I don't really care how I achieve it - whatever works.

My first try - I enabled WDS in my FritzBox 7390 router and set the wifi security to WEP128 (apparently either the WPN802 or the Fritzbox won't allow repeaters unless it's in WEP128). I then went into the WPN802 setup (via ethernet cable using the 192.168.0.210 <-> 192.168.0.231 connection). I set it up as per the http : //kb.netgear.com/app/answers/detail/a_id/215/~/configuring-wireless-repeating-with-a-wpn802-access-point page. The repeater appeared in my Fritzbox config which acknowledged it as a repeater with repeating functionality. All appeared to be perfectly setup. The only problem was that I never saw any actual repeating happening. I set the WPN802 up in a room where I only had one bar of signal strength. As I walked towards the WPN802 with an android tablet connected via wifi to the main router, my signal bars went down and down to one and stayed there, despite me being stood next to the WPN802. I disconnected and reconnected the wifi (thinking that might make it attach to the WPN802 instead of the Fritzbox). What happened was the tablet got stuck on "acquiring IP address" and into a disconnect/reconnect loop.

I couldn't find any solution to that, so I decided why not just setup the WPN802 to connect to the Fritzbox as a regular chained router. I wanted to make it register to the Fritzbox as a DHCP client using wifi, and then offer it's own DHCP services to any wifi user that connects to the WPN802. While in the ethernet cable using the 192.168.0.210 <-> 192.168.0.231 connection mode trying to set this up, I'd go into one menu, select DHCP and region and "apply" and then the WPN802 would do it's reboot and it would never come back. I'd be locked out until I did a 5-second reset on it. Besides, I didn't see in all the menus the concept of wifi-in and wifi-out. The wifi-in being the network that it wants to connect to, and the wifi-out being the wifi-network that it wants to provide by it's own SSID. This concept is easy with ethernet connected routers (you can daisy chain them), I don't know if it's possible with wifi routers.

Is there any hope?