Mitel 5320 on Asterisk System

I’ve been given a Mitel 5320, managed to get it into SIP mode & can access it via a browser to set up the basic bits of the phone. It logs onto my Asterisk phone system okay but there’s a bunch of BLF keys I would like to program but the browser only takes me to a ‘Quick Start’ page & nothing else. I tried different passwords to see there was a different programming level but only the admin / 5320 seems to do anything. Its a nice phone but I really would like to fully use it & get those nice BLF keys & the Voicemail fixed key to work as they would on a Mitel VoIP system. Any suggestions would be gratefully received

I have the same issue. Have you ever found a way?