The router was running with Attitude Adjustment 12.09 final.
I had some wifi instabilities I could not solve, which motivated me to try out a Barrier Breaker update.
This seems much better with Barrier Breaker RC3 (one day up and running at the moment).

- download the Barrier Breaker RC3 from there:
http://downloads.openwrt.org/barrier_br … pgrade.bin
Note the 'sysupgrade' in the name. This is the image required when updating using LuCi.

- go to the 'System > Backup / Flash Firmware' menu.

- select the new image to flash as new firmware and continue.

- verify the checksum displayed with the one of the file downloaded, and only continue if this matches.

- wait... (the router will restart)

- done

Just to be clear in case there are people new to openwrt visiting this thread: use the openwrt firmware file with "factory" in the filename to flash from the stock TP-Link firmware to openwrt. Once you are running openwrt, you can use the "sysupgrade" files.

By the way, this is a pretty standard procedure for all supported routers.

This is indeed standard upgrade procedure, according to this description: http://wiki.openwrt.org/doc/howto/gener … de.process