Updating Programmable XBee-PRO 900HP to 10K firmware not working

I need my Programmable XBee-PRO 900HP to use the 10K Point/Multipoint firmware. However, after updating it seems to stop working. Attaching the debugger shows that sys_hw_init never returns and appears to be stuck on something to do with the UART. The unit is basically useless to me in DigiMesh mode. Help!

Once again Digi, thanks for nothing. Another sterling example of your legendary support…