Clear nonvol is a little more comprehensive than a hard reset. From View Map page press the Speed field>Hold centre of Speedometer for several seconds to find the hidden Diagnostics Page>Developer Info>Nonvol Available>Clear Nonvol. Worth a try, then maybe do the full upgrade attempt if you want but it's your risk so your call. 100% agree to update just rgn14 would be too risky [imo a tad foolhardy in fact].
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