Ah, so, I presumed you changed the IP address after changed to repeater mode and then scan the router signal + key in password, save ? then just go back to your PC and change back to auto.
Basically for 868L a bit tricky :
1. go into 868l, change to repeater mode, reboot (2 mins)
2. go into your pc local network settings, manually input 192.168.0.51 (or any other 192.168.0.xx except xx=50) for IP address, subnet is automatic to 255.255.255.0
3.in browser go to 192.168.0.50 (868L default address when in repeater mode)
4. in wireless, do the scan (either 2.4Ghz or 5Ghz), input password, save and reboot (2 mins)
5.
** remember ** to change back your pc local network settings IP address back to auto (not specific 192.16.0.xx anymore), ie, "obtain an IP address automatically"
That's it