Je me suis enfin décidé, avec la reception des dernières pieces, à programmer la carte de controle.
Ca n'a pas été simple, et il y a surement des erreurs dans le lot. En effet, impossible de programmer une V3 (comme tout le monde, genre chez HobbyKing). Voici mon log :

Flash the firmware from repository.

C:\Documents and Settings\Administrateur\Mes documents\trivopter\kkmulticopterflashtool_0[1].60beta14\lib\avrdude\windows\avrdude.exe -C 
 C:\Documents and Settings\Administrateur\Mes documents\trivopter\kkmulticopterflashtool_0[1].60beta14\lib\avrdude\windows\avrdude.conf -p 
 m328p -P usb -c usbasp -B 8 -e -U lfuse:w:0xe2:m -U hfuse:w:0xd9:m

avrdude.exe: set SCK frequency to 93750 Hz
avrdude.exe: warning: cannot set sck period. please check for usbasp firmware update.
avrdude.exe: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.02s

avrdude.exe: Device signature = 0x1e950f
avrdude.exe: erasing chip
avrdude.exe: set SCK frequency to 93750 Hz
avrdude.exe: warning: cannot set sck period. please check for usbasp firmware update.
avrdude.exe: reading input file "0xe2"
avrdude.exe: writing lfuse (1 bytes):

Writing | ################################################## | 100% -0.00s

avrdude.exe: 1 bytes of lfuse written
avrdude.exe: verifying lfuse memory against 0xe2:
avrdude.exe: load data lfuse data from input file 0xe2:
avrdude.exe: input file 0xe2 contains 1 bytes
avrdude.exe: reading on-chip lfuse data:

Reading | ################################################## | 100% -0.00s

avrdude.exe: verifying ...
avrdude.exe: 1 bytes of lfuse verified
avrdude.exe: reading input file "0xd9"
avrdude.exe: writing hfuse (1 bytes):

Writing | ################################################## | 100% 0.05s

avrdude.exe: 1 bytes of hfuse written
avrdude.exe: verifying hfuse memory against 0xd9:
avrdude.exe: load data hfuse data from input file 0xd9:
avrdude.exe: input file 0xd9 contains 1 bytes
avrdude.exe: reading on-chip hfuse data:

Reading | ################################################## | 100% -0.00s

avrdude.exe: verifying ...
avrdude.exe: 1 bytes of hfuse verified

avrdude.exe done.  Thank you.

Flashing firmware from file.: C:\Documents and Settings\Administrateur\Mes documents\trivopter\kkmulticopterflashtool_0[1].60beta14\tmp\XXcontrol_KR_TriCopter_v2_5.hex

C:\Documents and Settings\Administrateur\Mes documents\trivopter\kkmulticopterflashtool_0[1].60beta14\lib\avrdude\windows\avrdude.exe -C 
 C:\Documents and Settings\Administrateur\Mes documents\trivopter\kkmulticopterflashtool_0[1].60beta14\lib\avrdude\windows\avrdude.conf -p m328p -P usb -c usbasp -B 8 -e -U 
 flash:w:C:\Documents and Settings\Administrateur\Mes documents\trivopter\kkmulticopterflashtool_0[1].60beta14\tmp\XXcontrol_KR_TriCopter_v2_5.hex:i

avrdude.exe: set SCK frequency to 93750 Hz
avrdude.exe: warning: cannot set sck period. please check for usbasp firmware update.
avrdude.exe: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.03s

avrdude.exe: Device signature = 0x1e950f
avrdude.exe: erasing chip
avrdude.exe: set SCK frequency to 93750 Hz
avrdude.exe: warning: cannot set sck period. please check for usbasp firmware update.
avrdude.exe: reading input file "C:\Documents and Settings\Administrateur\Mes documents\trivopter\kkmulticopterflashtool_0[1].60beta14\tmp\XXcontrol_KR_TriCopter_v2_5.hex"
avrdude.exe: writing flash (6288 bytes):

Writing | ################################################## | 100% 3.89s

avrdude.exe: 6288 bytes of flash written
avrdude.exe: verifying flash memory against C:\Documents and Settings\Administrateur\Mes documents\trivopter\kkmulticopterflashtool_0[1].60beta14\tmp\XXcontrol_KR_TriCopter_v2_5.hex:
avrdude.exe: load data flash data from input file C:\Documents and Settings\Administrateur\Mes documents\trivopter\kkmulticopterflashtool_0[1].60beta14\tmp\XXcontrol_KR_TriCopter_v2_5.hex:
avrdude.exe: input file C:\Documents and Settings\Administrateur\Mes documents\trivopter\kkmulticopterflashtool_0[1].60beta14\tmp\XXcontrol_KR_TriCopter_v2_5.hex contains 6288 bytes
avrdude.exe: reading on-chip flash data:

Reading | ################################################## | 100% 3.55s

avrdude.exe: verifying ...
avrdude.exe: 6288 bytes of flash verified

avrdude.exe done.  Thank you.