I was trying to upgrade my iMac to BigSur OS. When I try to download the BigSur OSX App file from Self Service, The size of the file is getting reduced to 27.5MB. Whereas the actual size of the OSX File is around 12.26GB.
With the same 27.5MB File, I upgraded my machine to BigSur OS without any error and it is working fine.
Anyone tried upgrading their iMac through Self Service and experienced the similar behaviour?
(Devices are managed through JAMF)