Refill Brother LC-3219 LC-3217 inkjet cartridge, ink chip replacement

How to refill inkjet cartridges replacing Brother LC-3219 and LC-3217 cartridges? The tutorial also demonstrates replacing the old empty ink chip on such a cartridge with a new alternative ink chip.

Refill inks for Brother LC3219 LC3217: https://www.octopus-office.de/shop/en...

Ink chips for Brother LC3219: https://www.octopus-office.de/shop/en...

ECO-Fill tips for refill syringes:
https://www.octopus-office.de/shop/en...

This tutorial works for the inkjet cartrides of the following printer models:
MFC-J 5330 DW,
MFC-J 5330 DW XL,
MFC-J 5335 DW,
MFC-J 5335 DWF,
MFC-J 5730 DW,
MFC-J 5830 DW,
MFC-J 5930 DW,
MFC-J 6530 DW,
MFC-J 6535 DW,
MFC-J 6535 DW XL,
MFC-J 6730 DW,
MFC-J 6930 DW,
MFC-J 6935 DW,
MFC-J 6935 DWF