Welcome to Topsony, Bruno ! Download SeTool2Lite 1.11, install USB flash driver and identify your K750. If it is CID49, you can flash :
K750_R1DB001_MAIN_EU_1_CL_RED49
K750_R1DB001_FS_EUROPE_5_RED49 and customize with:
K750i_CDA102337_13_R6A_Generic_EUROPE_5
Look at step 2 of this tutorial:
http://www.topsony.com/forum/se-tool...html#post63634