Thanks for your reply, I'll check that once I'll check that once I'm home.
I used to use "WPA/WPA2 Personal (PSK) mixed mode TKIP+CCMP" and encryption mode for years under TomatoUSB, maybe for better compatibility with all my stuff I don't even remember why.
Broadcomm wireless isn't friendly to any open-source project.
Broadcom has not released any FOSS drivers. Broadcom doesn’t support open-source much at all.
DD-WRT has a license agreement and NDA in place with Broadcom that allow usage of better, proprietary, closed source wireless drivers (binary blobs) which they are not allowed to redistribute freely.
LEDE / OpenWrt use only FOSS drivers. Fully open-source support for Broadcom wifi chips is very limited.
Limited means: 2.4GHz only b/g available, and 5GHz doesn't work at all. [...]