Hi Ziaul,
I did before exactly the same, but still problems after the manually update. After that a placed the backup and inform you.
So, you updated Helix Ultimate and template to 2.1.2, and i did manually J 5.1 to 5.3 with the original update file (another browser (firefox) with emptied cache and history). And again the same failure:
At the controlpanel:
all red marked:
unknown extensions...
unknown reguest…
error checking overrides.
After clicking at Joomla is up-to-date in the next screen:
An error has occurred.
0 Could not load root metadata.
What is happened and how to fix?
I'll leave it as it is now, so you can see for yourself. You have the login.
Bye,
Grafiek