Hi There,
Just an update on the said subject, I have not tested this but got the files directly from ALFA Tech support.
I will try the method described to revert back to ALFA stock firmware (firmware image is provided in the ALFA website), UBOOT file is attached including the HOWTO
Firmware image: http://sourceforge.net/projects/alfanetwork/files/Firmware/AP121_V2.5_r2887_WEB.img/download
UBOOT + HOWTO : https://copy.com/CGE4XIoC9VxCiei8