Managed to fix this, I think, at least it seems to working again without any issues atm
After looking around it seems this can occur on actual Synology devices as well.
At least there the person can call synology for help. Not so much on xpenology.
From what I can guess this error can occur if you use the Web Station.
The apache config can become corrupt somehow and as such you cannot log back into the server.
So I had to reinstall the DSM pat file.
Wasnt as simple as it sounds.
First try to run jun loader as reinstall, if you are lucky it will reinstall from that.
Mine didnt.
With mine I removed all the drives from my server then ran the jun loader as reinstall.
This way find.synology.com worked and saw there were no drive in the system
I plugged the drives back in, even though the G1610T doesnt support hotswap.
A couple of tries of refreshing the page brought up the option to migrate server.
When you do this select a clean installation, this keeps your files but removes all apps, settings and other data.
BUT this will crash at around 56%
But this is fine, as this means it's formatted the OS partition of your server.
Restart your server with the drives plugged in and reinstall with Jun loader.
Open find.synology.com and migrate your server again, and again select clean installation.
This time hopefully it will complete the installation, when you start it it will ask all the original setup questions like making an admin account etc.
But when you go to file station your folders and files should all still be there.