A bit confused trying to get Atmosphere working again - error screen, not bricked...

So I have a Switch that I had on Atmosphere till now w no issues.

Now however, no idea how as I am on Airplane mode, but found my daughter playing on the switch and calling me to tell me it crashed. Well. To cut things short my lovely daughter thought she was updating a game....and all the sudden I am on ofw 11.0.1.

No biggie I thought. I will just update atmos.

So I go to sdsetup install the basics, thinking a hekate payload will do the trick.

Looking good until I try to go into cfw. - it gives me this screen.

If I restart it does the same. I can get into Lakka fine. And I can boot into Horizon no issues.

I am on AutoRCM so can always get into Hekate, but this screen confuses me, what can i have done wrong? Any pointers would be great.

 

I used the latest atmos I think? 0.17.1?

 

Oh I thought it was just about overwriting. Will delete the whole folder and extract it once more.

Also what is Mesosphere and why do I / don't I need it?

 

So deleted atmos folder which got me there, but now none of the games work lol. So sigpatches. I enter RCM w Hekate, so I should use the ones posted by Shadowone333, for Atmosphere (Hekate/fss0/fusee-secondary only) - correct?

Sorry about all the questions - I just really feel like a n00b - Atmosphere & Hekate were way simpler to install in the beginning....

And huge thanks for all your help @Lacius