ubr7246vxr - is 4-byte BGP AS number supported?

Hello everyone,

I have a cisco uBR7246vxr cmts with NPE-G1 card. I'd like to use it as a BGP router. I've downloaded the latest software ubr7200-ik8su2-mz.123-23.BC10.bin.

My problem is I can't set a 4-byte AS number:

bgprouter(config)#router bgp ?
<1-65535> Autonomous system number


Am I doing something wrong? Is 4-byte AS number supported on uBR7246vxr?