I asked Jann Lassalle, the owner of the "Imprimante en question" blog who said I could share the V3400 tool. So below a link to download it, with the procedure I used to enter service mode on my MG6350 :
1. DOWNLOAD Service Tool V3400 for Canon iP, MG series here : http://bit.ly/2ziaVP9
2...
I used Service Tool V3400 today to reset the ink absorber counter on MG6350.
I tested the file with https://www.virustotal.com and no virus detected.
EEPROM print now says D=000.0, INK CLR=01, and everything seems to work
I received the file here...