How to completelly kill all traces of V6 config

RouterOS General
1

Hi, i just received a CRS326-24G-2S+, (factory 6.48.6)

i decided to try the “recommended” procedure to exorcize V6, and did a netinstall straight away
(7.14rc1)

the very first thing in the logs on subsequent boots is “crossfig will update v6 configuration”
but i tought the whole point of netinstall was that the flash was zeroized (apart from bootloader and license), and that there should be no trace left of v6 oldconfig

so, how is this possible, and how do i instruct RouterOS to really clean all hidden old leftovers?
v6stuff.png

2

When running netinstall, there’s option called “Keep old configuration” … make sure it’s not checked.

3

Nothing was selected (apart from “keep license”)
netinstall-326.png
–edit–

I also tried downgrade to v7.13.5 (via the system upgrade tool), then upgrade again to 7.14rc1 via winbox
the “migrating v6 config” message persists