Unable to flash AREDN FW to RBLHG-5HPnD XL

I get the below message on the PXE load, and when I try to load the FW the second time permanently I get "Bad Gateway." I've used the AREDN documented method successfully with another RBLHG-5HPnD XL, but for some reason I cannot get this one to work. Thoughts?

node: NOCALL-252-114-178
model: MikroTik RouterBOARD RBLHG-5HPnD

!!!! UNSUPPORTED DEVICE !!!!
boardid: MikroTik RouterBOARD RBLHG-5HPnD
Device has not been tested. Please file a ticket with your experiences.

br-lan C4:AD:34:FD:72:B2
eth0   C4:AD:34:FD:72:B2
eth0.1 C4:AD:34:FD:72:B2
eth0.2 C4:AD:34:FD:72:B2
tunl0  00-00-00-00-00-00-00-44-00-00-00-00-00-00-00-00
wlan0  C4:AD:34:FC:72:B2

/proc/cpuinfo
system type        : Atheros AR9344 rev 3
machine            : MikroTik RouterBOARD RBLHG-5HPnD
processor        : 0
cpu model        : MIPS 74Kc V4.12
BogoMIPS        : 299.82
wait instruction    : yes
microsecond timers    : yes
tlb_entries        : 32
extra interrupt vector    : yes
hardware watchpoint    : yes, count: 4, address/irw mask: [0x0ffc, 0x0ffc, 0x0ffb, 0x0ffb]
isa            : mips1 mips2 mips32r1 mips32r2
ASEs implemented    : mips16 dsp dsp2
Options implemented    : tlb 4kex 4k_cache prefetch mcheck ejtag llsc dc_aliases perf_cntr_intr_bit nan_legacy nan_2008 perf
shadow register sets    : 1
kscratch registers    : 0
package            : 0
core            : 0
VCED exceptions        : not available
VCEI exceptions        : not available


nvram
hsmmmesh.settings=settings
hsmmmesh.settings.wifimac='c4:ad:34:fc:72:b2'
hsmmmesh.settings.mac2='252.114.178'
hsmmmesh.settings.node='NOCALL-252-114-178'
hsmmmesh.settings.dtdmac='252.114.177'