A user pointed me to the HAME MPR-A2 portable wireless router and after checking that OpenWrt works on it I ordered one from here:
After around 1 month it finally arrived.
The OpenWrt images (with ddserver) are here:
You need both images, first the ‘uImage’ is flashed using the original HAME administration interface and after that using the OpenWrt administration interface the ‘sysupgrade’ image is flashed.
I wrote a small flashing instructions : HAME MPR-A2 flashing instructions
Here is an image compared to TP-Link MR3040 (V1)