Yes it is true,
You can flash a wave to a 3000 but HEn does not always still work after,
Sacrifice HEn for Wave - Wave goodbye to HEn,
People have also flashed font's and boot waves but some have bricked because it was a bad wave,
The rule with HEn is don't flash anything as you could end up with a brick,
If you do then you may just end up with a bunch of hardly used PSP 3000 spare parts,
Do some research and see the amount of people that have ignored the no flashing advice because they are not so happy now,
id love to see how this will end