There is no need to go back to old old old old old oleg Fimware.

The Enthusiast-Fimware features both kernels 2.4 and 2.6. Just use WL500gp-1.9.2.7-d-r2624 (d-Branch is kernel 2.4) if you have issues with the rtn-Branch (kernel 2.6).

lly and theMiron did a great job enhancing the last oleg. They fixed many security issues and improved stability.