I add my TL W841n configured with 1.7.0 and upgraded to 1.7.1. ALl was fine. The configuration survived to the upgrade and stability went from booting required to normal operation.
I add to had a device as a static dhcp lease, so I did it and found that all the DHCP leases have been lost.
I tried this morning to restore the configuration backup I had done before the upgrade and the configuration is wiped again, but fully this time and password has been reset to default factory password. And most of the langauge string show undefined.

Any way to work this around and have my original conf restored without redoing it all ?