Strap fails with index out of range error

[giosal]

Hi all,

So I've set the Claymore's Dual Miner to mine on my MSI Radeon R9 390 Gaming 8G with the following options:
-y 1 -rxboost 1 -dcri 10
but when I add strap, no matter which one, it fails with index out of range error.
Obviously, Secure Boot is of, driver is installed (I launched miner with -driver install option) and I'm running the miner as administrator.
ReadMe clearly states that Hawaii cards are supported for strap.
Does anyone have any idea? Maybe someone has a string like HAWS8 (which doesn't work btw, so I assume it's not HAW for Hawaii, like it's POL for Polaris)?

Thank you in advance