Hi,
As the subject say there is no vbmeta.img file in the e-3.1.1-a15-20250830521751-community-gts7lwifi.zip file.
There are no previous version available in the download section. It would be nice to have this file in the zip. @Manoj can you maybe pass this on to the team.
For the great helpers around here, what is the best work around? I see some posts in the search of the site. Where is best place to get the payload file or should I find it in a Lineage build?
Any ideas welcome 
You can try getting the vbmeta using Payload dumper. Lineage builds if for the same OS version should also have the vbmeta.
Passing on the information to the team.
I found the file I needed here:
https://download.lineageos.org/devices/gts7lwifi/builds
Just having issues getting to recovery, I recall it’s tricky.
I ended up bricking or softback this device. Anyone know where you find the stock ROM, the legitimate way LOL. What a joke all the websites that put you in a loop, then they want me to pay, like I would trust the site after that LOL
Anyway my error is:
partition vbmeta
Reason vbmeta: Public key used to sign dar rejected. (05)
CUSTOM vbmeta
VBMETA : No sign info.
Samsung do not publish their own builds so as I understand it you are down to one of four:
I cannot say which is best for a free download but if free, in my experience, it will be slow.