EPSON Stylus SX400
I own an EPSON Stylus SX400, and I managed to run the two passes test reports.
testreport.log testreport2.log
Based on escputil, the current ink levels are:
Cyan 76% Magenta 2% Yellow 79% Black 100%
Is it possible to reset the waste ink counter?
It seems doable, yes.
To write to the counter's memory address, you can add an entry in printer.c, recompile reink and then run it. Or maybe simpler, use my reinkpy.
To know which address to write to, you can guess and try from other known models.
Or, at your own risk, run the opaque "Adjustment program" leaked in the magnet link ?xt=urn:btih:09904d6bda8a6aacb0649a1911af4d171cda7910&dn=Epson%20Service In which case it would be kind to record and publish the USB traffic (see wireshark).