nanocom numpty guide

Can anyone give me a step by step guide for how to save BCU setting changes?
I've removed the air suspension on the back of my D2 and replaced with coils. I've left all the hardware in place and wired up although I would like to remove it all at a later date. Buddy's got a nanocom evo so we hooked it up and switched the slabs setting to coil. Came out and went back in to check and it's switched back to air. Tried numerous times and always the same. Something we're missing? Also tried switching it, pressing "x", closing down in the correct way and then locking the vehicle for 2 minutes as I have read that is the way to save the settings but still it switches back to air!!!

Did you write the settings?

Change the setting to coil.
scroll over using lower button to next page and press "write settings", it will then tell you to turn off ignition for 60 secs. press OK .

wait 60 secs and I turned unit off got out locked car opened turned ignition on and then turned the nanaocom back on and checked and hey presto it says coils.

Cheers

That sounds like where we are going wrong, thanks!