GBA Flash Advance Xtreme Linker + Flash Advance Xtreme 128m Carts

[cpoco]

Later on I figured it out. It seems that the reason it initially stuck at 1% is due to insufficient electric input. After I connect both the charger and USB port at the same time(which is actually adviced against in the manual), the weirdness is gone, and the Linker start to function normally. However, I still cannot flash ROMs into the cartridges. It always gives me errors except for one or two success. Can you help me with this?