Any chance that you upload the 4.1 FW version?
Should be a GCD file in the Garmin directory.
When did you buy the 765?
The FW 5.5 should not have any limitations in adding TMC.
I remember there was a posting long time ago regarding erasing all subscriptions, but this involved a data programmer.
I removed subscriptions, but they were not showing up anymore in the diagnostic menu, whether they complete erased is not known to me
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