Firmware 3.201_beta3

How does one load this firmware, as I tried an “unofficial” build (Snapshot 3.201 "Upgrade" Woes) and it was a nightmare.
This morning tried the beta 2 and had the same problems - flash seemed to go OK but router wouldn’t boot.
So am I right in thinking this is for Uboot only or is it just me (my router)?

Hap
(AR300M)