I haven't seen the above 100:54 error code before, however it may be linked to the 100:70 error code which is usually displayed during initial setup when the box has not yet received its entitlement for Live TV and should resolve within a few minutes.
Have you tried rebooting the 360?
Something else to consider, did you perform the upgrade over the phone, or was online, or via sms/ whatsapp?
If it was done over the phone then the new channels are usually added immediately. However, if you are also receiving new equipment as part of the regrade, then they won't be added until the new equipment is installed and activated.
Any other method normally takes between 48 and 72 hours as the channels need to be added manually.
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