SDHC is not a supported R4 format. The only NDS Flash Loader that takes SDHC is the SuperCard One (green boxed, not blue)
about the phone ...
SanDisk microSDHC ( Maximum Capacity) / Mobile Phone Compatibility List
2007 December
SanDisk internal tests conducted on available models. Similar models may be compatible. Compatibility not guaranteed.
Manufacturer Model Memory Card Maximum Capacity
HTC S710 microSDHC 8GB
HTC Touch microSDHC 8GB
HTC TyTN II microSDHC 8GB
LG Muziq microSDHC 4GB
LG VX8550 (Chocolate) microSDHC 8GB
LG VX8700 microSDHC 4GB
LG VX9400 microSDHC 4GB
LG VX9900 (enV) microSDHC 4GB
Motorola RAZR V9M microSDHC 6GB
Motorola RIZR Z6TV microSDHC 6GB
Nokia 6267 microSDHC 4GB
Nokia 6290 microSDHC 4GB
Nokia 7500 microSDHC 8GB
Nokia 5700 Xpress Music microSDHC 4GB
Nokia 6110 Navigator microSDHC 8GB
Nokia 6120c microSDHC 8GB
Nokia E90 microSDHC 8GB
Nokia N95 microSDHC 8GB
Palm Centro microSDHC 4GB
RIM Blackberry 8100 (Pearl) microSDHC 4GB
RIM Blackberry 8300 (Curve) microSDHC 4GB
RIM Blackberry 8800 microSDHC 4GB
RIM Blackberry 8830 microSDHC 4GB
Sagem My 511x microSDHC 4GB
Samsung SGH-F200 microSDHC 4GB
Samsung SGH-F210 microSDHC 4GB
T-Mobile MDA Touch microSDHC 8GB
T-Mobile Wing microSDHC 8GB
SanDisk, December 2007 Page 1
Looks like SanDisk tested the Moto V9M and it worked with an SDHC card. Again, the Moto site said only 2GB.
Hell if I know at this point.